move browser to webbrowser/

1 files changed, 0 insertions, 1399 deletions

diff --git a/components/downloads/content/allDownloadsViewOverlay.js b/components/downloads/content/allDownloadsViewOverlay.js
deleted file mode 100644
index 4830f21..0000000
--- a/components/downloads/content/allDownloadsViewOverlay.js
+++ /dev/null
@@ -1,1399 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-var { classes: Cc, interfaces: Ci, utils: Cu, results: Cr } = Components;
-
-Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-
-XPCOMUtils.defineLazyModuleGetter(this, "DownloadUtils",
-                                  "resource://gre/modules/DownloadUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "DownloadsCommon",
-                                  "resource:///modules/DownloadsCommon.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "DownloadsViewUI",
-                                  "resource:///modules/DownloadsViewUI.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "FileUtils",
-                                  "resource://gre/modules/FileUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
-                                  "resource://gre/modules/NetUtil.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "OS",
-                                  "resource://gre/modules/osfile.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
-                                  "resource://gre/modules/PlacesUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "Promise",
-                                  "resource://gre/modules/Promise.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "RecentWindow",
-                                  "resource:///modules/RecentWindow.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "Services",
-                                  "resource://gre/modules/Services.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "Task",
-                                  "resource://gre/modules/Task.jsm");
-
-const nsIDM = Ci.nsIDownloadManager;
-
-const DESTINATION_FILE_URI_ANNO  = "downloads/destinationFileURI";
-const DOWNLOAD_META_DATA_ANNO    = "downloads/metaData";
-
-const DOWNLOAD_VIEW_SUPPORTED_COMMANDS =
- ["cmd_delete", "cmd_copy", "cmd_paste", "cmd_selectAll",
-  "downloadsCmd_pauseResume", "downloadsCmd_cancel",
-  "downloadsCmd_open", "downloadsCmd_show", "downloadsCmd_retry",
-  "downloadsCmd_openReferrer", "downloadsCmd_clearDownloads"];
-
-/**
- * Represents a download from the browser history. It implements part of the
- * interface of the Download object.
- *
- * @param aPlacesNode
- *        The Places node from which the history download should be initialized.
- */
-function HistoryDownload(aPlacesNode) {
-  // TODO (bug 829201): history downloads should get the referrer from Places.
-  this.source = {
-    url: aPlacesNode.uri,
-  };
-  this.target = {
-    path: undefined,
-    exists: false,
-    size: undefined,
-  };
-
-  // In case this download cannot obtain its end time from the Places metadata,
-  // use the time from the Places node, that is the start time of the download.
-  this.endTime = aPlacesNode.time / 1000;
-}
-
-HistoryDownload.prototype = {
-  /**
-   * Pushes information from Places metadata into this object.
-   */
-  updateFromMetaData(metaData) {
-    try {
-      this.target.path = Cc["@mozilla.org/network/protocol;1?name=file"]
-                           .getService(Ci.nsIFileProtocolHandler)
-                           .getFileFromURLSpec(metaData.targetFileSpec).path;
-    } catch (ex) {
-      this.target.path = undefined;
-    }
-
-    if ("state" in metaData) {
-      this.succeeded = metaData.state == nsIDM.DOWNLOAD_FINISHED;
-      this.error = metaData.state == nsIDM.DOWNLOAD_FAILED
-                   ? { message: "History download failed." }
-                   : metaData.state == nsIDM.DOWNLOAD_BLOCKED_PARENTAL
-                   ? { becauseBlockedByParentalControls: true }
-                   : metaData.state == nsIDM.DOWNLOAD_DIRTY
-                   ? { becauseBlockedByReputationCheck: true }
-                   : null;
-      this.canceled = metaData.state == nsIDM.DOWNLOAD_CANCELED ||
-                      metaData.state == nsIDM.DOWNLOAD_PAUSED;
-      this.endTime = metaData.endTime;
-
-      // Normal history downloads are assumed to exist until the user interface
-      // is refreshed, at which point these values may be updated.
-      this.target.exists = true;
-      this.target.size = metaData.fileSize;
-    } else {
-      // Metadata might be missing from a download that has started but hasn't
-      // stopped already. Normally, this state is overridden with the one from
-      // the corresponding in-progress session download. But if the browser is
-      // terminated abruptly and additionally the file with information about
-      // in-progress downloads is lost, we may end up using this state. We use
-      // the failed state to allow the download to be restarted.
-      //
-      // On the other hand, if the download is missing the target file
-      // annotation as well, it is just a very old one, and we can assume it
-      // succeeded.
-      this.succeeded = !this.target.path;
-      this.error = this.target.path ? { message: "Unstarted download." } : null;
-      this.canceled = false;
-
-      // These properties may be updated if the user interface is refreshed.
-      this.target.exists = false;
-      this.target.size = undefined;
-    }
-  },
-
-  /**
-   * History downloads are never in progress.
-   */
-  stopped: true,
-
-  /**
-   * No percentage indication is shown for history downloads.
-   */
-  hasProgress: false,
-
-  /**
-   * History downloads cannot be restarted using their partial data, even if
-   * they are indicated as paused in their Places metadata. The only way is to
-   * use the information from a persisted session download, that will be shown
-   * instead of the history download. In case this session download is not
-   * available, we show the history download as canceled, not paused.
-   */
-  hasPartialData: false,
-
-  /**
-   * This method mimicks the "start" method of session downloads, and is called
-   * when the user retries a history download.
-   *
-   * At present, we always ask the user for a new target path when retrying a
-   * history download. In the future we may consider reusing the known target
-   * path if the folder still exists and the file name is not already used,
-   * except when the user preferences indicate that the target path should be
-   * requested every time a new download is started.
-   */
-  start() {
-    let browserWin = RecentWindow.getMostRecentBrowserWindow();
-    let initiatingDoc = browserWin ? browserWin.document : document;
-
-    // Do not suggest a file name if we don't know the original target.
-    let leafName = this.target.path ? OS.Path.basename(this.target.path) : null;
-    DownloadURL(this.source.url, leafName, initiatingDoc);
-
-    return Promise.resolve();
-  },
-
-  /**
-   * This method mimicks the "refresh" method of session downloads, except that
-   * it cannot notify that the data changed to the Downloads View.
-   */
-  refresh: Task.async(function* () {
-    try {
-      this.target.size = (yield OS.File.stat(this.target.path)).size;
-      this.target.exists = true;
-    } catch (ex) {
-      // We keep the known file size from the metadata, if any.
-      this.target.exists = false;
-    }
-  }),
-};
-
-/**
- * A download element shell is responsible for handling the commands and the
- * displayed data for a single download view element.
- *
- * The shell may contain a session download, a history download, or both.  When
- * both a history and a session download are present, the session download gets
- * priority and its information is displayed.
- *
- * On construction, a new richlistitem is created, and can be accessed through
- * the |element| getter. The shell doesn't insert the item in a richlistbox, the
- * caller must do it and remove the element when it's no longer needed.
- *
- * The caller is also responsible for forwarding status notifications for
- * session downloads, calling the onStateChanged and onChanged methods.
- *
- * @param [optional] aSessionDownload
- *        The session download, required if aHistoryDownload is not set.
- * @param [optional] aHistoryDownload
- *        The history download, required if aSessionDownload is not set.
- */
-function HistoryDownloadElementShell(aSessionDownload, aHistoryDownload) {
-  this.element = document.createElement("richlistitem");
-  this.element._shell = this;
-
-  this.element.classList.add("download");
-  this.element.classList.add("download-state");
-
-  if (aSessionDownload) {
-    this.sessionDownload = aSessionDownload;
-  }
-  if (aHistoryDownload) {
-    this.historyDownload = aHistoryDownload;
-  }
-}
-
-HistoryDownloadElementShell.prototype = {
-  __proto__: DownloadsViewUI.DownloadElementShell.prototype,
-
-  /**
-   * Manages the "active" state of the shell.  By default all the shells without
-   * a session download are inactive, thus their UI is not updated.  They must
-   * be activated when entering the visible area.  Session downloads are always
-   * active.
-   */
-  ensureActive: function DES_ensureActive() {
-    if (!this._active) {
-      this._active = true;
-      this.element.setAttribute("active", true);
-      this._updateUI();
-    }
-  },
-  get active() !!this._active,
-
-  /**
-   * Overrides the base getter to return the Download or HistoryDownload object
-   * for displaying information and executing commands in the user interface.
-   */
-  get download() this._sessionDownload || this._historyDownload,
-
-  _sessionDownload: null,
-  get sessionDownload() this._sessionDownload,
-  set sessionDownload(aValue) {
-    if (this._sessionDownload != aValue) {
-      if (!aValue && !this._historyDownload) {
-        throw new Error("Should always have either a Download or a HistoryDownload");
-      }
-
-      this._sessionDownload = aValue;
-
-      this.ensureActive();
-      this._updateUI();
-    }
-    return aValue;
-  },
-
-  _historyDownload: null,
-  get historyDownload() this._historyDownload,
-  set historyDownload(aValue) {
-    if (this._historyDownload != aValue) {
-      if (!aValue && !this._sessionDownload) {
-        throw new Error("Should always have either a Download or a HistoryDownload");
-      }
-
-      this._historyDownload = aValue;
-
-      // We don't need to update the UI if we had a session data item, because
-      // the places information isn't used in this case.
-      if (!this._sessionDownload) {
-        this._updateUI();
-      }
-    }
-    return aValue;
-  },
-
-  _updateUI() {
-    // There is nothing to do if the item has always been invisible.
-    if (!this.active) {
-      return;
-    }
-
-    // Since the state changed, we may need to check the target file again.
-    this._targetFileChecked = false;
-
-    this._updateState();
-  },
-
-  get statusTextAndTip() {
-    let status = this.rawStatusTextAndTip;
-
-    // The base object would show extended progress information in the tooltip,
-    // but we move this to the main view and never display a tooltip.
-    if (!this.download.stopped) {
-      status.text = status.tip;
-    }
-    status.tip = "";
-
-    return status;
-  },
-
-  onStateChanged() {
-    this.element.setAttribute("image", this.image);
-    this.element.setAttribute("state",
-                              DownloadsCommon.stateOfDownload(this.download));
-
-    if (this.element.selected) {
-      goUpdateDownloadCommands();
-    } else {
-      goUpdateCommand("downloadsCmd_clearDownloads");
-    }
-  },
-
-  onChanged() {
-    this._updateProgress();
-  },
-
-  /* nsIController */
-  isCommandEnabled: function DES_isCommandEnabled(aCommand) {
-    // The only valid command for inactive elements is cmd_delete.
-    if (!this.active && aCommand != "cmd_delete")
-      return false;
-    switch (aCommand) {
-      case "downloadsCmd_open":
-        // This property is false if the download did not succeed.
-        return this.download.target.exists;
-      case "downloadsCmd_show":
-        // TODO: Bug 827010 - Handle part-file asynchronously.
-        if (this._sessionDownload && this.download.target.partFilePath) {
-          let partFile = new FileUtils.File(this.download.target.partFilePath);
-          if (partFile.exists()) {
-            return true;
-          }
-        }
-
-        // This property is false if the download did not succeed.
-        return this.download.target.exists;
-      case "downloadsCmd_pauseResume":
-        return this.download.hasPartialData && !this.download.error;
-      case "downloadsCmd_retry":
-        return this.download.canceled || this.download.error;
-      case "downloadsCmd_openReferrer":
-        return !!this.download.source.referrer;
-      case "cmd_delete":
-        // We don't want in-progress downloads to be removed accidentally.
-        return this.download.stopped;
-      case "downloadsCmd_cancel":
-        return !!this._sessionDownload;
-    }
-    return false;
-  },
-
-  /* nsIController */
-  doCommand: function DES_doCommand(aCommand) {
-    switch (aCommand) {
-      case "downloadsCmd_open": {
-        let file = new FileUtils.File(this.download.target.path);
-        DownloadsCommon.openDownloadedFile(file, null, window);
-        break;
-      }
-      case "downloadsCmd_show": {
-        let file = new FileUtils.File(this.download.target.path);
-        DownloadsCommon.showDownloadedFile(file);
-        break;
-      }
-      case "downloadsCmd_openReferrer": {
-        openURL(this.download.source.referrer);
-        break;
-      }
-      case "downloadsCmd_cancel": {
-        this.download.cancel().catch(() => {});
-        this.download.removePartialData().catch(Cu.reportError);
-        break;
-      }
-      case "cmd_delete": {
-        if (this._sessionDownload) {
-          DownloadsCommon.removeAndFinalizeDownload(this.download);
-        }
-        if (this._historyDownload) {
-          let uri = NetUtil.newURI(this.download.source.url);
-          PlacesUtils.bhistory.removePage(uri);
-        }
-        break;
-      }
-      case "downloadsCmd_retry": {
-        // Errors when retrying are already reported as download failures.
-        this.download.start().catch(() => {});
-        break;
-      }
-      case "downloadsCmd_pauseResume": {
-        // This command is only enabled for session downloads.
-        if (this.download.stopped) {
-          this.download.start();
-        } else {
-          this.download.cancel();
-        }
-        break;
-      }
-    }
-  },
-
-  // Returns whether or not the download handled by this shell should
-  // show up in the search results for the given term.  Both the display
-  // name for the download and the url are searched.
-  matchesSearchTerm: function DES_matchesSearchTerm(aTerm) {
-    if (!aTerm)
-      return true;
-    aTerm = aTerm.toLowerCase();
-    return this.displayName.toLowerCase().contains(aTerm) ||
-           this.download.source.url.toLowerCase().contains(aTerm);
-  },
-
-  // Handles return keypress on the element (the keypress listener is
-  // set in the DownloadsPlacesView object).
-  doDefaultCommand: function DES_doDefaultCommand() {
-    function getDefaultCommandForState(aState) {
-      switch (aState) {
-        case nsIDM.DOWNLOAD_FINISHED:
-          return "downloadsCmd_open";
-        case nsIDM.DOWNLOAD_PAUSED:
-          return "downloadsCmd_pauseResume";
-        case nsIDM.DOWNLOAD_NOTSTARTED:
-        case nsIDM.DOWNLOAD_QUEUED:
-          return "downloadsCmd_cancel";
-        case nsIDM.DOWNLOAD_FAILED:
-        case nsIDM.DOWNLOAD_CANCELED:
-          return "downloadsCmd_retry";
-        case nsIDM.DOWNLOAD_SCANNING:
-          return "downloadsCmd_show";
-        case nsIDM.DOWNLOAD_BLOCKED_PARENTAL:
-        case nsIDM.DOWNLOAD_DIRTY:
-        case nsIDM.DOWNLOAD_BLOCKED_POLICY:
-          return "downloadsCmd_openReferrer";
-      }
-      return "";
-    }
-    let state = DownloadsCommon.stateOfDownload(this.download);
-    let command = getDefaultCommandForState(state);
-    if (command && this.isCommandEnabled(command))
-      this.doCommand(command);
-  },
-
-  /**
-   * This method is called by the outer download view, after the controller
-   * commands have already been updated. In case we did not check for the
-   * existence of the target file already, we can do it now and then update
-   * the commands as needed.
-   */
-  onSelect: function DES_onSelect() {
-    if (!this.active)
-      return;
-
-    // If this is a history download for which no target file information is
-    // available, we cannot retrieve information about the target file.
-    if (!this.download.target.path) {
-      return;
-    }
-
-    // Start checking for existence.  This may be done twice if onSelect is
-    // called again before the information is collected.
-    if (!this._targetFileChecked) {
-      this._checkTargetFileOnSelect().catch(Cu.reportError);
-    }
-  },
-
-  _checkTargetFileOnSelect: Task.async(function* () {
-    try {
-      yield this.download.refresh();
-    } finally {
-      // Do not try to check for existence again if this failed once.
-      this._targetFileChecked = true;
-    }
-
-    // Update the commands only if the element is still selected.
-    if (this.element.selected) {
-      goUpdateDownloadCommands();
-    }
-
-    // Ensure the interface has been updated based on the new values. We need to
-    // do this because history downloads can't trigger update notifications.
-    this._updateProgress();
-  }),
-};
-
-/**
- * A Downloads Places View is a places view designed to show a places query
- * for history downloads alongside the session downloads.
- *
- * As we don't use the places controller, some methods implemented by other
- * places views are not implemented by this view.
- *
- * A richlistitem in this view can represent either a past download or a session
- * download, or both. Session downloads are shown first in the view, and as long
- * as they exist they "collapses" their history "counterpart" (So we don't show two
- * items for every download).
- */
-function DownloadsPlacesView(aRichListBox, aActive = true) {
-  this._richlistbox = aRichListBox;
-  this._richlistbox._placesView = this;
-  window.controllers.insertControllerAt(0, this);
-
-  // Map download URLs to download element shells regardless of their type
-  this._downloadElementsShellsForURI = new Map();
-
-  // Map download data items to their element shells.
-  this._viewItemsForDownloads = new WeakMap();
-
-  // Points to the last session download element. We keep track of this
-  // in order to keep all session downloads above past downloads.
-  this._lastSessionDownloadElement = null;
-
-  this._searchTerm = "";
-
-  this._active = aActive;
-
-  // Register as a downloads view. The places data will be initialized by
-  // the places setter.
-  this._initiallySelectedElement = null;
-  this._downloadsData = DownloadsCommon.getData(window.opener || window);
-  this._downloadsData.addView(this);
-
-  // Get the Download button out of the attention state since we're about to
-  // view all downloads.
-  DownloadsCommon.getIndicatorData(window).attention = false;
-
-  // Make sure to unregister the view if the window is closed.
-  window.addEventListener("unload", function() {
-    window.controllers.removeController(this);
-    this._downloadsData.removeView(this);
-    this.result = null;
-  }.bind(this), true);
-  // Resizing the window may change items visibility.
-  window.addEventListener("resize", function() {
-    this._ensureVisibleElementsAreActive();
-  }.bind(this), true);
-}
-
-DownloadsPlacesView.prototype = {
-  get associatedElement() this._richlistbox,
-
-  get active() this._active,
-  set active(val) {
-    this._active = val;
-    if (this._active)
-      this._ensureVisibleElementsAreActive();
-    return this._active;
-  },
-
-  /**
-   * This cache exists in order to optimize the load of the Downloads View, when
-   * Places annotations for history downloads must be read. In fact, annotations
-   * are stored in a single table, and reading all of them at once is much more
-   * efficient than an individual query.
-   *
-   * When this property is first requested, it reads the annotations for all the
-   * history downloads and stores them indefinitely.
-   *
-   * The historical annotations are not expected to change for the duration of
-   * the session, except in the case where a session download is running for the
-   * same URI as a history download. To ensure we don't use stale data, URIs
-   * corresponding to session downloads are permanently removed from the cache.
-   * This is a very small mumber compared to history downloads.
-   *
-   * This property returns a Map from each download source URI found in Places
-   * annotations to an object with the format:
-   *
-   * { targetFileSpec, state, endTime, fileSize, ... }
-   *
-   * The targetFileSpec property is the value of "downloads/destinationFileURI",
-   * while the other properties are taken from "downloads/metaData". Any of the
-   * properties may be missing from the object.
-   */
-  get _cachedPlacesMetaData() {
-    if (!this.__cachedPlacesMetaData) {
-      this.__cachedPlacesMetaData = new Map();
-
-      // Read the metadata annotations first, but ignore invalid JSON.
-      for (let result of PlacesUtils.annotations.getAnnotationsWithName(
-                                                 DOWNLOAD_META_DATA_ANNO)) {
-        try {
-          this.__cachedPlacesMetaData.set(result.uri.spec,
-                                          JSON.parse(result.annotationValue));
-        } catch (ex) {}
-      }
-
-      // Add the target file annotations to the metadata.
-      for (let result of PlacesUtils.annotations.getAnnotationsWithName(
-                                                 DESTINATION_FILE_URI_ANNO)) {
-        let metaData = this.__cachedPlacesMetaData.get(result.uri.spec);
-        if (!metaData) {
-          metaData = {};
-          this.__cachedPlacesMetaData.set(result.uri.spec, metaData);
-        }
-        metaData.targetFileSpec = result.annotationValue;
-      }
-    }
-
-    return this.__cachedPlacesMetaData;
-  },
-  __cachedPlacesMetaData: null,
-
-  /**
-   * Reads current metadata from Places annotations for the specified URI, and
-   * returns an object with the format:
-   *
-   * { targetFileSpec, state, endTime, fileSize, ... }
-   *
-   * The targetFileSpec property is the value of "downloads/destinationFileURI",
-   * while the other properties are taken from "downloads/metaData". Any of the
-   * properties may be missing from the object.
-   */
-  _getPlacesMetaDataFor(spec) {
-    let metaData = {};
-
-    try {
-      let uri = NetUtil.newURI(spec);
-      try {
-        metaData = JSON.parse(PlacesUtils.annotations.getPageAnnotation(
-                                          uri, DOWNLOAD_META_DATA_ANNO));
-      } catch (ex) {}
-      metaData.targetFileSpec = PlacesUtils.annotations.getPageAnnotation(
-                                            uri, DESTINATION_FILE_URI_ANNO);
-    } catch (ex) {}
-
-    return metaData;
-  },
-
-  /**
-   * Given a data item for a session download, or a places node for a past
-   * download, updates the view as necessary.
-   *  1. If the given data is a places node, we check whether there are any
-   *     elements for the same download url. If there are, then we just reset
-   *     their places node. Otherwise we add a new download element.
-   *  2. If the given data is a data item, we first check if there's a history
-   *     download in the list that is not associated with a data item. If we
-   *     found one, we use it for the data item as well and reposition it
-   *     alongside the other session downloads. If we don't, then we go ahead
-   *     and create a new element for the download.
-   *
-   * @param [optional] sessionDownload
-   *        A Download object, or null for history downloads.
-   * @param [optional] aPlacesNode
-   *        The Places node for a history download, or null for session downloads.
-   * @param [optional] aNewest
-   *        @see onDownloadAdded. Ignored for history downloads.
-   * @param [optional] aDocumentFragment
-   *        To speed up the appending of multiple elements to the end of the
-   *        list which are coming in a single batch (i.e. invalidateContainer),
-   *        a document fragment may be passed to which the new elements would
-   *        be appended. It's the caller's job to ensure the fragment is merged
-   *        to the richlistbox at the end.
-   */
-  _addDownloadData(sessionDownload, aPlacesNode, aNewest = false,
-                               aDocumentFragment = null) {
-    let downloadURI = aPlacesNode ? aPlacesNode.uri
-                                  : sessionDownload.source.url;
-    let shellsForURI = this._downloadElementsShellsForURI.get(downloadURI);
-    if (!shellsForURI) {
-      shellsForURI = new Set();
-      this._downloadElementsShellsForURI.set(downloadURI, shellsForURI);
-    }
-
-    // When a session download is attached to a shell, we ensure not to keep
-    // stale metadata around for the corresponding history download. This
-    // prevents stale state from being used if the view is rebuilt.
-    //
-    // Note that we will eagerly load the data in the cache at this point, even
-    // if we have seen no history download. The case where no history download
-    // will appear at all is rare enough in normal usage, so we can apply this
-    // simpler solution rather than keeping a list of cache items to ignore.
-    if (sessionDownload) {
-      this._cachedPlacesMetaData.delete(sessionDownload.source.url);
-    }
-
-    let newOrUpdatedShell = null;
-
-    // Trivial: if there are no shells for this download URI, we always
-    // need to create one.
-    let shouldCreateShell = shellsForURI.size == 0;
-
-    // However, if we do have shells for this download uri, there are
-    // few options:
-    // 1) There's only one shell and it's for a history download (it has
-    //    no data item). In this case, we update this shell and move it
-    //    if necessary
-    // 2) There are multiple shells, indicating multiple downloads for
-    //    the same download uri are running. In this case we create
-    //    another shell for the download (so we have one shell for each data
-    //    item).
-    //
-    // Note: If a cancelled session download is already in the list, and the
-    // download is retried, onDownloadAdded is called again for the same
-    // data item. Thus, we also check that we make sure we don't have a view item
-    // already.
-    if (!shouldCreateShell &&
-        sessionDownload && !this._viewItemsForDownloads.has(sessionDownload)) {
-      // If there's a past-download-only shell for this download-uri with no
-      // associated data item, use it for the new data item. Otherwise, go ahead
-      // and create another shell.
-      shouldCreateShell = true;
-      for (let shell of shellsForURI) {
-        if (!shell.sessionDownload) {
-          shouldCreateShell = false;
-          shell.sessionDownload = sessionDownload;
-          newOrUpdatedShell = shell;
-          this._viewItemsForDownloads.set(sessionDownload, shell);
-          break;
-        }
-      }
-    }
-
-    if (shouldCreateShell) {
-      // If we are adding a new history download here, it means there is no
-      // associated session download, thus we must read the Places metadata,
-      // because it will not be obscured by the session download.
-      let historyDownload = null;
-      if (aPlacesNode) {
-        let metaData = this._cachedPlacesMetaData.get(aPlacesNode.uri) ||
-                       this._getPlacesMetaDataFor(aPlacesNode.uri);
-        historyDownload = new HistoryDownload(aPlacesNode);
-        historyDownload.updateFromMetaData(metaData);
-      }
-      let shell = new HistoryDownloadElementShell(sessionDownload,
-                                                  historyDownload);
-      shell.element._placesNode = aPlacesNode;
-      newOrUpdatedShell = shell;
-      shellsForURI.add(shell);
-      if (sessionDownload) {
-        this._viewItemsForDownloads.set(sessionDownload, shell);
-      }
-    }
-    else if (aPlacesNode) {
-      // We are updating information for a history download for which we have
-      // at least one download element shell already. There are two cases:
-      // 1) There are one or more download element shells for this source URI,
-      //    each with an associated session download. We update the Places node
-      //    because we may need it later, but we don't need to read the Places
-      //    metadata until the last session download is removed.
-      // 2) Occasionally, we may receive a duplicate notification for a history
-      //    download with no associated session download. We have exactly one
-      //    download element shell in this case, but the metdata cannot have
-      //    changed, just the reference to the Places node object is different.
-      // So, we update all the node references and keep the metadata intact.
-      for (let shell of shellsForURI) {
-        if (!shell.historyDownload) {
-          // Create the element to host the metadata when needed.
-          shell.historyDownload = new HistoryDownload(aPlacesNode);
-        }
-        shell.element._placesNode = aPlacesNode;
-      }
-    }
-
-    if (newOrUpdatedShell) {
-      if (aNewest) {
-        this._richlistbox.insertBefore(newOrUpdatedShell.element,
-                                       this._richlistbox.firstChild);
-        if (!this._lastSessionDownloadElement) {
-          this._lastSessionDownloadElement = newOrUpdatedShell.element;
-        }
-        // Some operations like retrying an history download move an element to
-        // the top of the richlistbox, along with other session downloads.
-        // More generally, if a new download is added, should be made visible.
-        this._richlistbox.ensureElementIsVisible(newOrUpdatedShell.element);
-      } else if (sessionDownload) {
-        let before = this._lastSessionDownloadElement ?
-          this._lastSessionDownloadElement.nextSibling : this._richlistbox.firstChild;
-        this._richlistbox.insertBefore(newOrUpdatedShell.element, before);
-        this._lastSessionDownloadElement = newOrUpdatedShell.element;
-      }
-      else {
-        let appendTo = aDocumentFragment || this._richlistbox;
-        appendTo.appendChild(newOrUpdatedShell.element);
-      }
-
-      if (this.searchTerm) {
-        newOrUpdatedShell.element.hidden =
-          !newOrUpdatedShell.element._shell.matchesSearchTerm(this.searchTerm);
-      }
-    }
-
-    // If aDocumentFragment is defined this is a batch change, so it's up to
-    // the caller to append the fragment and activate the visible shells.
-    if (!aDocumentFragment) {
-      this._ensureVisibleElementsAreActive();
-      goUpdateCommand("downloadsCmd_clearDownloads");
-    }
-  },
-
-  _removeElement: function DPV__removeElement(aElement) {
-    // If the element was selected exclusively, select its next
-    // sibling first, if not, try for previous sibling, if any.
-    if ((aElement.nextSibling || aElement.previousSibling) &&
-        this._richlistbox.selectedItems &&
-        this._richlistbox.selectedItems.length == 1 &&
-        this._richlistbox.selectedItems[0] == aElement) {
-      this._richlistbox.selectItem(aElement.nextSibling ||
-                                   aElement.previousSibling);
-    }
-
-    if (this._lastSessionDownloadElement == aElement)
-      this._lastSessionDownloadElement = aElement.previousSibling;
-
-    this._richlistbox.removeItemFromSelection(aElement);
-    this._richlistbox.removeChild(aElement);
-    this._ensureVisibleElementsAreActive();
-    goUpdateCommand("downloadsCmd_clearDownloads");
-  },
-
-  _removeHistoryDownloadFromView:
-  function DPV__removeHistoryDownloadFromView(aPlacesNode) {
-    let downloadURI = aPlacesNode.uri;
-    let shellsForURI = this._downloadElementsShellsForURI.get(downloadURI);
-    if (shellsForURI) {
-      for (let shell of shellsForURI) {
-        if (shell.sessionDownload) {
-          shell.historyDownload = null;
-        }
-        else {
-          this._removeElement(shell.element);
-          shellsForURI.delete(shell);
-          if (shellsForURI.size == 0)
-            this._downloadElementsShellsForURI.delete(downloadURI);
-        }
-      }
-    }
-  },
-
-  _removeSessionDownloadFromView(download) {
-    let shells = this._downloadElementsShellsForURI
-                     .get(download.source.url);
-    if (shells.size == 0)
-      throw new Error("Should have had at leaat one shell for this uri");
-
-    let shell = this._viewItemsForDownloads.get(download);
-    if (!shells.has(shell))
-      throw new Error("Missing download element shell in shells list for url");
-
-    // If there's more than one item for this download uri, we can let the
-    // view item for this this particular data item go away.
-    // If there's only one item for this download uri, we should only
-    // keep it if it is associated with a history download.
-    if (shells.size > 1 || !shell.historyDownload) {
-      this._removeElement(shell.element);
-      shells.delete(shell);
-      if (shells.size == 0)
-        this._downloadElementsShellsForURI.delete(download.source.url);
-    }
-    else {
-      // We have one download element shell containing both a session download
-      // and a history download, and we are now removing the session download.
-      // Previously, we did not use the Places metadata because it was obscured
-      // by the session download. Since this is no longer the case, we have to
-      // read the latest metadata before removing the session download.
-      let url = shell.historyDownload.source.url;
-      let metaData = this._getPlacesMetaDataFor(url);
-      shell.historyDownload.updateFromMetaData(metaData);
-      shell.sessionDownload = null;
-      // Move it below the session-download items;
-      if (this._lastSessionDownloadElement == shell.element) {
-        this._lastSessionDownloadElement = shell.element.previousSibling;
-      }
-      else {
-        let before = this._lastSessionDownloadElement ?
-          this._lastSessionDownloadElement.nextSibling : this._richlistbox.firstChild;
-        this._richlistbox.insertBefore(shell.element, before);
-      }
-    }
-  },
-
-  _ensureVisibleElementsAreActive:
-  function DPV__ensureVisibleElementsAreActive() {
-    if (!this.active || this._ensureVisibleTimer || !this._richlistbox.firstChild)
-      return;
-
-    this._ensureVisibleTimer = setTimeout(function() {
-      delete this._ensureVisibleTimer;
-      if (!this._richlistbox.firstChild)
-        return;
-
-      let rlbRect = this._richlistbox.getBoundingClientRect();
-      let winUtils = window.QueryInterface(Ci.nsIInterfaceRequestor)
-                           .getInterface(Ci.nsIDOMWindowUtils);
-      let nodes = winUtils.nodesFromRect(rlbRect.left, rlbRect.top,
-                                         0, rlbRect.width, rlbRect.height, 0,
-                                         true, false);
-      // nodesFromRect returns nodes in z-index order, and for the same z-index
-      // sorts them in inverted DOM order, thus starting from the one that would
-      // be on top.
-      let firstVisibleNode, lastVisibleNode;
-      for (let node of nodes) {
-        if (node.localName === "richlistitem" && node._shell) {
-          node._shell.ensureActive();
-          // The first visible node is the last match.
-          firstVisibleNode = node;
-          // While the last visible node is the first match.
-          if (!lastVisibleNode)
-            lastVisibleNode = node;
-        }
-      }
-
-      // Also activate the first invisible nodes in both boundaries (that is,
-      // above and below the visible area) to ensure proper keyboard navigation
-      // in both directions.
-      let nodeBelowVisibleArea = lastVisibleNode && lastVisibleNode.nextSibling;
-      if (nodeBelowVisibleArea && nodeBelowVisibleArea._shell)
-        nodeBelowVisibleArea._shell.ensureActive();
-
-      let nodeABoveVisibleArea =
-        firstVisibleNode && firstVisibleNode.previousSibling;
-      if (nodeABoveVisibleArea && nodeABoveVisibleArea._shell)
-        nodeABoveVisibleArea._shell.ensureActive();
-    }.bind(this), 10);
-  },
-
-  _place: "",
-  get place() this._place,
-  set place(val) {
-    // Don't reload everything if we don't have to.
-    if (this._place == val) {
-      // XXXmano: places.js relies on this behavior (see Bug 822203).
-      this.searchTerm = "";
-      return val;
-    }
-
-    this._place = val;
-
-    let history = PlacesUtils.history;
-    let queries = { }, options = { };
-    history.queryStringToQueries(val, queries, { }, options);
-    if (!queries.value.length)
-      queries.value = [history.getNewQuery()];
-
-    let result = history.executeQueries(queries.value, queries.value.length,
-                                        options.value);
-    result.addObserver(this, false);
-    return val;
-  },
-
-  _result: null,
-  get result() this._result,
-  set result(val) {
-    if (this._result == val)
-      return val;
-
-    if (this._result) {
-      this._result.removeObserver(this);
-      this._resultNode.containerOpen = false;
-    }
-
-    if (val) {
-      this._result = val;
-      this._resultNode = val.root;
-      this._resultNode.containerOpen = true;
-      this._ensureInitialSelection();
-    }
-    else {
-      delete this._resultNode;
-      delete this._result;
-    }
-
-    return val;
-  },
-
-  get selectedNodes() {
-    return [for (element of this._richlistbox.selectedItems)
-            if (element._placesNode)
-            element._placesNode];
-  },
-
-  get selectedNode() {
-    let selectedNodes = this.selectedNodes;
-    return selectedNodes.length == 1 ? selectedNodes[0] : null;
-  },
-
-  get hasSelection() this.selectedNodes.length > 0,
-
-  containerStateChanged:
-  function DPV_containerStateChanged(aNode, aOldState, aNewState) {
-    this.invalidateContainer(aNode)
-  },
-
-  invalidateContainer:
-  function DPV_invalidateContainer(aContainer) {
-    if (aContainer != this._resultNode)
-      throw new Error("Unexpected container node");
-    if (!aContainer.containerOpen)
-      throw new Error("Root container for the downloads query cannot be closed");
-
-    let suppressOnSelect = this._richlistbox.suppressOnSelect;
-    this._richlistbox.suppressOnSelect = true;
-    try {
-      // Remove the invalidated history downloads from the list and unset the
-      // places node for data downloads.
-      // Loop backwards since _removeHistoryDownloadFromView may removeChild().
-      for (let i = this._richlistbox.childNodes.length - 1; i >= 0; --i) {
-        let element = this._richlistbox.childNodes[i];
-        if (element._placesNode) {
-          this._removeHistoryDownloadFromView(element._placesNode);
-        }
-      }
-    }
-    finally {
-      this._richlistbox.suppressOnSelect = suppressOnSelect;
-    }
-
-    if (aContainer.childCount > 0) {
-      let elementsToAppendFragment = document.createDocumentFragment();
-      for (let i = 0; i < aContainer.childCount; i++) {
-        try {
-          this._addDownloadData(null, aContainer.getChild(i), false,
-                                elementsToAppendFragment);
-        }
-        catch(ex) {
-          Cu.reportError(ex);
-        }
-      }
-
-      // _addDownloadData may not add new elements if there were already
-      // data items in place.
-      if (elementsToAppendFragment.firstChild) {
-        this._appendDownloadsFragment(elementsToAppendFragment);
-        this._ensureVisibleElementsAreActive();
-      }
-    }
-
-    goUpdateDownloadCommands();
-  },
-
-  _appendDownloadsFragment: function DPV__appendDownloadsFragment(aDOMFragment) {
-    // Workaround multiple reflows hang by removing the richlistbox
-    // and adding it back when we're done.
-
-    // Hack for bug 836283: reset xbl fields to their old values after the
-    // binding is reattached to avoid breaking the selection state
-    let xblFields = new Map();
-    for (let [key, value] in Iterator(this._richlistbox)) {
-      xblFields.set(key, value);
-    }
-
-    let parentNode = this._richlistbox.parentNode;
-    let nextSibling = this._richlistbox.nextSibling;
-    parentNode.removeChild(this._richlistbox);
-    this._richlistbox.appendChild(aDOMFragment);
-    parentNode.insertBefore(this._richlistbox, nextSibling);
-
-    for (let [key, value] of xblFields) {
-      this._richlistbox[key] = value;
-    }
-  },
-
-  nodeInserted: function DPV_nodeInserted(aParent, aPlacesNode) {
-    this._addDownloadData(null, aPlacesNode);
-  },
-
-  nodeRemoved: function DPV_nodeRemoved(aParent, aPlacesNode, aOldIndex) {
-    this._removeHistoryDownloadFromView(aPlacesNode);
-  },
-
-  nodeAnnotationChanged() {},
-  nodeIconChanged() {},
-  nodeTitleChanged() {},
-  nodeKeywordChanged: function() {},
-  nodeDateAddedChanged: function() {},
-  nodeLastModifiedChanged: function() {},
-  nodeHistoryDetailsChanged: function() {},
-  nodeTagsChanged: function() {},
-  sortingChanged: function() {},
-  nodeMoved: function() {},
-  nodeURIChanged: function() {},
-  batching: function() {},
-
-  get controller() this._richlistbox.controller,
-
-  get searchTerm() this._searchTerm,
-  set searchTerm(aValue) {
-    if (this._searchTerm != aValue) {
-      for (let element of this._richlistbox.childNodes) {
-        element.hidden = !element._shell.matchesSearchTerm(aValue);
-      }
-      this._ensureVisibleElementsAreActive();
-    }
-    return this._searchTerm = aValue;
-  },
-
-  /**
-   * When the view loads, we want to select the first item.
-   * However, because session downloads, for which the data is loaded
-   * asynchronously, always come first in the list, and because the list
-   * may (or may not) already contain history downloads at that point, it
-   * turns out that by the time we can select the first item, the user may
-   * have already started using the view.
-   * To make things even more complicated, in other cases, the places data
-   * may be loaded after the session downloads data.  Thus we cannot rely on
-   * the order in which the data comes in.
-   * We work around this by attempting to select the first element twice,
-   * once after the places data is loaded and once when the session downloads
-   * data is done loading.  However, if the selection has changed in-between,
-   * we assume the user has already started using the view and give up.
-   */
-  _ensureInitialSelection: function DPV__ensureInitialSelection() {
-    // Either they're both null, or the selection has not changed in between.
-    if (this._richlistbox.selectedItem == this._initiallySelectedElement) {
-      let firstDownloadElement = this._richlistbox.firstChild;
-      if (firstDownloadElement != this._initiallySelectedElement) {
-        // We may be called before _ensureVisibleElementsAreActive,
-        // or before the download binding is attached. Therefore, ensure the
-        // first item is activated, and pass the item to the richlistbox
-        // setters only at a point we know for sure the binding is attached.
-        firstDownloadElement._shell.ensureActive();
-        Services.tm.mainThread.dispatch(function() {
-          this._richlistbox.selectedItem = firstDownloadElement;
-          this._richlistbox.currentItem = firstDownloadElement;
-          this._initiallySelectedElement = firstDownloadElement;
-        }.bind(this), Ci.nsIThread.DISPATCH_NORMAL);
-      }
-    }
-  },
-
-  onDataLoadStarting: function() { },
-  onDataLoadCompleted: function DPV_onDataLoadCompleted() {
-    this._ensureInitialSelection();
-  },
-
-  onDownloadAdded(download, newest) {
-    this._addDownloadData(download, null, newest);
-  },
-
-  onDownloadStateChanged(download) {
-    this._viewItemsForDownloads.get(download).onStateChanged();
-  },
-
-  onDownloadChanged(download) {
-    this._viewItemsForDownloads.get(download).onChanged();
-  },
-
-  onDownloadRemoved(download) {
-    this._removeSessionDownloadFromView(download);
-  },
-
-  supportsCommand: function DPV_supportsCommand(aCommand) {
-    if (DOWNLOAD_VIEW_SUPPORTED_COMMANDS.indexOf(aCommand) != -1) {
-      // The clear-downloads command may be performed by the toolbar-button,
-      // which can be focused on OS X.  Thus enable this command even if the
-      // richlistbox is not focused.
-      // For other commands, be prudent and disable them unless the richlistview
-      // is focused. It's important to make the decision here rather than in
-      // isCommandEnabled.  Otherwise our controller may "steal" commands from
-      // other controls in the window (see goUpdateCommand &
-      // getControllerForCommand).
-      if (document.activeElement == this._richlistbox ||
-          aCommand == "downloadsCmd_clearDownloads") {
-        return true;
-      }
-    }
-    return false;
-  },
-
-  isCommandEnabled: function DPV_isCommandEnabled(aCommand) {
-    switch (aCommand) {
-      case "cmd_copy":
-        return this._richlistbox.selectedItems.length > 0;
-      case "cmd_selectAll":
-        return true;
-      case "cmd_paste":
-        return this._canDownloadClipboardURL();
-      case "downloadsCmd_clearDownloads":
-        return this._canClearDownloads();
-      default:
-        return Array.every(this._richlistbox.selectedItems, function(element) {
-          return element._shell.isCommandEnabled(aCommand);
-        });
-    }
-  },
-
-  _canClearDownloads: function DPV__canClearDownloads() {
-    // Downloads can be cleared if there's at least one removable download in
-    // the list (either a history download or a completed session download).
-    // Because history downloads are always removable and are listed after the
-    // session downloads, check from bottom to top.
-    for (let elt = this._richlistbox.lastChild; elt; elt = elt.previousSibling) {
-      // Stopped, paused, and failed downloads with partial data are removed.
-      let download = elt._shell.download;
-      if (download.stopped && !(download.canceled && download.hasPartialData)) {
-        return true;
-      }
-    }
-    return false;
-  },
-
-  _copySelectedDownloadsToClipboard:
-  function DPV__copySelectedDownloadsToClipboard() {
-    let urls = [for (element of this._richlistbox.selectedItems)
-                element._shell.download.source.url];
-
-    Cc["@mozilla.org/widget/clipboardhelper;1"]
-      .getService(Ci.nsIClipboardHelper)
-      .copyString(urls.join("\n"), document);
-  },
-
-  _getURLFromClipboardData: function DPV__getURLFromClipboardData() {
-    let trans = Cc["@mozilla.org/widget/transferable;1"].
-                createInstance(Ci.nsITransferable);
-    trans.init(null);
-
-    let flavors = ["text/x-moz-url", "text/unicode"];
-    flavors.forEach(trans.addDataFlavor);
-
-    Services.clipboard.getData(trans, Services.clipboard.kGlobalClipboard);
-
-    // Getting the data or creating the nsIURI might fail.
-    try {
-      let data = {};
-      trans.getAnyTransferData({}, data, {});
-      let [url, name] = data.value.QueryInterface(Ci.nsISupportsString)
-                            .data.split("\n");
-      if (url)
-        return [NetUtil.newURI(url, null, null).spec, name];
-    }
-    catch(ex) { }
-
-    return ["", ""];
-  },
-
-  _canDownloadClipboardURL: function DPV__canDownloadClipboardURL() {
-    let [url, name] = this._getURLFromClipboardData();
-    return url != "";
-  },
-
-  _downloadURLFromClipboard: function DPV__downloadURLFromClipboard() {
-    let [url, name] = this._getURLFromClipboardData();
-    let browserWin = RecentWindow.getMostRecentBrowserWindow();
-    let initiatingDoc = browserWin ? browserWin.document : document;
-    DownloadURL(url, name, initiatingDoc);
-  },
-
-  doCommand: function DPV_doCommand(aCommand) {
-    // Commands may be invoked with keyboard shortcuts even if disabled.
-    if (!this.isCommandEnabled(aCommand)) {
-      return;
-    }
-    switch (aCommand) {
-      case "cmd_copy":
-        this._copySelectedDownloadsToClipboard();
-        break;
-      case "cmd_selectAll":
-        this._richlistbox.selectAll();
-        break;
-      case "cmd_paste":
-        this._downloadURLFromClipboard();
-        break;
-      case "downloadsCmd_clearDownloads":
-        this._downloadsData.removeFinished();
-        if (this.result) {
-          Cc["@mozilla.org/browser/download-history;1"]
-            .getService(Ci.nsIDownloadHistory)
-            .removeAllDownloads();
-        }
-        // There may be no selection or focus change as a result
-        // of these change, and we want the command updated immediately.
-        goUpdateCommand("downloadsCmd_clearDownloads");
-        break;
-      default: {
-        // Cloning the nodelist into an array to get a frozen list of selected items.
-        // Otherwise, the selectedItems nodelist is live and doCommand may alter the
-        // selection while we are trying to do one particular action, like removing
-        // items from history.
-        let selectedElements = [...this._richlistbox.selectedItems];
-        for (let element of selectedElements) {
-          element._shell.doCommand(aCommand);
-        }
-      }
-    }
-  },
-
-  onEvent: function() { },
-
-  onContextMenu: function DPV_onContextMenu(aEvent)
-  {
-    let element = this._richlistbox.selectedItem;
-    if (!element || !element._shell)
-      return false;
-
-    // Set the state attribute so that only the appropriate items are displayed.
-    let contextMenu = document.getElementById("downloadsContextMenu");
-    let download = element._shell.download;
-    contextMenu.setAttribute("state",
-                             DownloadsCommon.stateOfDownload(download));
-
-    if (!download.stopped) {
-      // The hasPartialData property of a download may change at any time after
-      // it has started, so ensure we update the related command now.
-      goUpdateCommand("downloadsCmd_pauseResume");
-    }
-    return true;
-  },
-
-  onKeyPress: function DPV_onKeyPress(aEvent) {
-    let selectedElements = this._richlistbox.selectedItems;
-    if (aEvent.keyCode == KeyEvent.DOM_VK_RETURN) {
-      // In the content tree, opening bookmarks by pressing return is only
-      // supported when a single item is selected. To be consistent, do the
-      // same here.
-      if (selectedElements.length == 1) {
-        let element = selectedElements[0];
-        if (element._shell)
-          element._shell.doDefaultCommand();
-      }
-    }
-    else if (aEvent.charCode == " ".charCodeAt(0)) {
-      // Pause/Resume every selected download
-      for (let element of selectedElements) {
-        if (element._shell.isCommandEnabled("downloadsCmd_pauseResume"))
-          element._shell.doCommand("downloadsCmd_pauseResume");
-      }
-    }
-  },
-
-  onDoubleClick: function DPV_onDoubleClick(aEvent) {
-    if (aEvent.button != 0)
-      return;
-
-    let selectedElements = this._richlistbox.selectedItems;
-    if (selectedElements.length != 1)
-      return;
-
-    let element = selectedElements[0];
-    if (element._shell)
-      element._shell.doDefaultCommand();
-  },
-
-  onScroll: function DPV_onScroll() {
-    this._ensureVisibleElementsAreActive();
-  },
-
-  onSelect: function DPV_onSelect() {
-    goUpdateDownloadCommands();
-
-    let selectedElements = this._richlistbox.selectedItems;
-    for (let elt of selectedElements) {
-      if (elt._shell)
-        elt._shell.onSelect();
-    }
-  },
-
-  onDragStart: function DPV_onDragStart(aEvent) {
-    // TODO Bug 831358: Support d&d for multiple selection.
-    // For now, we just drag the first element.
-    let selectedItem = this._richlistbox.selectedItem;
-    if (!selectedItem)
-      return;
-
-    let targetPath = selectedItem._shell.download.target.path;
-    if (!targetPath) {
-      return;
-    }
-
-    // We must check for existence synchronously because this is a DOM event.
-    let file = new FileUtils.File(targetPath);
-    if (!file.exists())
-      return;
-
-    let dt = aEvent.dataTransfer;
-    dt.mozSetDataAt("application/x-moz-file", file, 0);
-    let url = Services.io.newFileURI(file).spec;
-    dt.setData("text/uri-list", url);
-    dt.setData("text/plain", url);
-    dt.effectAllowed = "copyMove";
-    dt.addElement(selectedItem);
-  },
-
-  onDragOver: function DPV_onDragOver(aEvent) {
-    let types = aEvent.dataTransfer.types;
-    if (types.contains("text/uri-list") ||
-        types.contains("text/x-moz-url") ||
-        types.contains("text/plain")) {
-      aEvent.preventDefault();
-    }
-  },
-
-  onDrop: function DPV_onDrop(aEvent) {
-    let dt = aEvent.dataTransfer;
-    // If dragged item is from our source, do not try to
-    // redownload already downloaded file.
-    if (dt.mozGetDataAt("application/x-moz-file", 0))
-      return;
-
-    let links = Services.droppedLinkHandler.dropLinks(aEvent);
-    if (!links.length)
-      return;
-    let browserWin = RecentWindow.getMostRecentBrowserWindow();
-    let initiatingDoc = browserWin ? browserWin.document : document;
-    for (let link of links) {
-      if (link.url.startsWith("about:"))
-        continue;
-      DownloadURL(link.url, link.name, initiatingDoc);
-    }
-  }
-};
-
-for (let methodName of ["load", "applyFilter", "selectNode", "selectItems"]) {
-  DownloadsPlacesView.prototype[methodName] = function() {
-    throw new Error("|" + methodName + "| is not implemented by the downloads view.");
-  }
-}
-
-function goUpdateDownloadCommands() {
-  for (let command of DOWNLOAD_VIEW_SUPPORTED_COMMANDS) {
-    goUpdateCommand(command);
-  }
-}