Revert "Add Basilisk"

This reverts commit e72ef92b5bdc43cd2584198e2e54e951b70299e8.

1 files changed, 0 insertions, 1135 deletions

diff --git a/application/basilisk/components/migration/MigrationUtils.jsm b/application/basilisk/components/migration/MigrationUtils.jsm
deleted file mode 100644
index fae959852..000000000
--- a/application/basilisk/components/migration/MigrationUtils.jsm
+++ /dev/null
@@ -1,1135 +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/. */
-
-#filter substitution
-
-"use strict";
-
-this.EXPORTED_SYMBOLS = ["MigrationUtils", "MigratorPrototype"];
-
-const { classes: Cc, interfaces: Ci, results: Cr, utils: Cu } = Components;
-const TOPIC_WILL_IMPORT_BOOKMARKS = "initial-migration-will-import-default-bookmarks";
-const TOPIC_DID_IMPORT_BOOKMARKS = "initial-migration-did-import-default-bookmarks";
-const TOPIC_PLACES_DEFAULTS_FINISHED = "places-browser-init-complete";
-
-Cu.import("resource://gre/modules/Services.jsm");
-Cu.import("resource://gre/modules/Task.jsm");
-Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-
-Cu.importGlobalProperties(["URL"]);
-
-XPCOMUtils.defineLazyModuleGetter(this, "AutoMigrate",
-                                  "resource:///modules/AutoMigrate.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "BookmarkHTMLUtils",
-                                  "resource://gre/modules/BookmarkHTMLUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "LoginHelper",
-                                  "resource://gre/modules/LoginHelper.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
-                                  "resource://gre/modules/PlacesUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "PromiseUtils",
-                                  "resource://gre/modules/PromiseUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "ResponsivenessMonitor",
-                                  "resource://gre/modules/ResponsivenessMonitor.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "Sqlite",
-                                  "resource://gre/modules/Sqlite.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "TelemetryStopwatch",
-                                  "resource://gre/modules/TelemetryStopwatch.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "WindowsRegistry",
-                                  "resource://gre/modules/WindowsRegistry.jsm");
-
-var gMigrators = null;
-var gProfileStartup = null;
-var gMigrationBundle = null;
-var gPreviousDefaultBrowserKey = "";
-
-let gKeepUndoData = false;
-let gUndoData = null;
-
-XPCOMUtils.defineLazyGetter(this, "gAvailableMigratorKeys", function() {
-#ifdef XP_WIN
-  return [
-    "firefox", "edge", "ie", "chrome", "chromium", "360se",
-    "canary"
-  ];
-#elif XP_MACOSX
-  return ["firefox", "safari", "chrome", "chromium", "canary"];
-#elif XP_UNIX
-  return ["firefox", "chrome", "chromium"];
-#else
-  return [];
-#endif
-});
-
-function getMigrationBundle() {
-  if (!gMigrationBundle) {
-    gMigrationBundle = Services.strings.createBundle(
-     "chrome://browser/locale/migration/migration.properties");
-  }
-  return gMigrationBundle;
-}
-
-/**
- * Shared prototype for migrators, implementing nsIBrowserProfileMigrator.
- *
- * To implement a migrator:
- * 1. Import this module.
- * 2. Create the prototype for the migrator, extending MigratorPrototype.
- *    Namely: MosaicMigrator.prototype = Object.create(MigratorPrototype);
- * 3. Set classDescription, contractID and classID for your migrator, and set
- *    NSGetFactory appropriately.
- * 4. If the migrator supports multiple profiles, override the sourceProfiles
- *    Here we default for single-profile migrator.
- * 5. Implement getResources(aProfile) (see below).
- * 6. If the migrator supports reading the home page of the source browser,
- *    override |sourceHomePageURL| getter.
- * 7. For startup-only migrators, override |startupOnlyMigrator|.
- */
-this.MigratorPrototype = {
-  QueryInterface: XPCOMUtils.generateQI([Ci.nsIBrowserProfileMigrator]),
-
-  /**
-   * OVERRIDE IF AND ONLY IF the source supports multiple profiles.
-   *
-   * Returns array of profile objects from which data may be imported. The object
-   * should have the following keys:
-   *   id - a unique string identifier for the profile
-   *   name - a pretty name to display to the user in the UI
-   *
-   * Only profiles from which data can be imported should be listed.  Otherwise
-   * the behavior of the migration wizard isn't well-defined.
-   *
-   * For a single-profile source (e.g. safari, ie), this returns null,
-   * and not an empty array.  That is the default implementation.
-   */
-  get sourceProfiles() {
-    return null;
-  },
-
-  /**
-   * MUST BE OVERRIDDEN.
-   *
-   * Returns an array of "migration resources" objects for the given profile,
-   * or for the "default" profile, if the migrator does not support multiple
-   * profiles.
-   *
-   * Each migration resource should provide:
-   * - a |type| getter, returning any of the migration types (see
-   *   nsIBrowserProfileMigrator).
-   *
-   * - a |migrate| method, taking a single argument, aCallback(bool success),
-   *   for migrating the data for this resource.  It may do its job
-   *   synchronously or asynchronously.  Either way, it must call
-   *   aCallback(bool aSuccess) when it's done.  In the case of an exception
-   *   thrown from |migrate|, it's taken as if aCallback(false) is called.
-   *
-   *   Note: In the case of a simple asynchronous implementation, you may find
-   *   MigrationUtils.wrapMigrateFunction handy for handling aCallback easily.
-   *
-   * For each migration type listed in nsIBrowserProfileMigrator, multiple
-   * migration resources may be provided.  This practice is useful when the
-   * data for a certain migration type is independently stored in few
-   * locations.  For example, the mac version of Safari stores its "reading list"
-   * bookmarks in a separate property list.
-   *
-   * Note that the importation of a particular migration type is reported as
-   * successful if _any_ of its resources succeeded to import (that is, called,
-   * |aCallback(true)|).  However, completion-status for a particular migration
-   * type is reported to the UI only once all of its migrators have called
-   * aCallback.
-   *
-   * @note  The returned array should only include resources from which data
-   *        can be imported.  So, for example, before adding a resource for the
-   *        BOOKMARKS migration type, you should check if you should check that the
-   *        bookmarks file exists.
-   *
-   * @param aProfile
-   *        The profile from which data may be imported, or an empty string
-   *        in the case of a single-profile migrator.
-   *        In the case of multiple-profiles migrator, it is guaranteed that
-   *        aProfile is a value returned by the sourceProfiles getter (see
-   *        above).
-   */
-  getResources: function MP_getResources(/* aProfile */) {
-    throw new Error("getResources must be overridden");
-  },
-
-  /**
-   * OVERRIDE in order to provide an estimate of when the last time was
-   * that somebody used the browser. It is OK that this is somewhat fuzzy -
-   * history may not be available (or be wiped or not present due to e.g.
-   * incognito mode).
-   *
-   * @return a Promise that resolves to the last used date.
-   *
-   * @note If not overridden, the promise will resolve to the unix epoch.
-   */
-  getLastUsedDate() {
-    return Promise.resolve(new Date(0));
-  },
-
-  /**
-   * OVERRIDE IF AND ONLY IF the migrator is a startup-only migrator (For now,
-   * that is just the Firefox migrator, see bug 737381).  Default: false.
-   *
-   * Startup-only migrators are different in two ways:
-   * - they may only be used during startup.
-   * - the user-profile is half baked during migration.  The folder exists,
-   *   but it's only accessible through MigrationUtils.profileStartup.
-   *   The migrator can call MigrationUtils.profileStartup.doStartup
-   *   at any point in order to initialize the profile.
-   */
-  get startupOnlyMigrator() {
-    return false;
-  },
-
-  /**
-   * OVERRIDE IF AND ONLY IF your migrator supports importing the homepage.
-   * @see nsIBrowserProfileMigrator
-   */
-  get sourceHomePageURL() {
-    return "";
-  },
-
-  /**
-   * Override if the data to migrate is locked/in-use and the user should
-   * probably shutdown the source browser.
-   */
-  get sourceLocked() {
-    return false;
-  },
-
-  /**
-   * DO NOT OVERRIDE - After deCOMing migration, the UI will just call
-   * getResources.
-   *
-   * @see nsIBrowserProfileMigrator
-   */
-  getMigrateData: function MP_getMigrateData(aProfile) {
-    let resources = this._getMaybeCachedResources(aProfile);
-    if (!resources) {
-      return [];
-    }
-    let types = resources.map(r => r.type);
-    return types.reduce((a, b) => { a |= b; return a }, 0);
-  },
-
-  getBrowserKey: function MP_getBrowserKey() {
-    return this.contractID.match(/\=([^\=]+)$/)[1];
-  },
-
-  /**
-   * DO NOT OVERRIDE - After deCOMing migration, the UI will just call
-   * migrate for each resource.
-   *
-   * @see nsIBrowserProfileMigrator
-   */
-  migrate: function MP_migrate(aItems, aStartup, aProfile) {
-    let resources = this._getMaybeCachedResources(aProfile);
-    if (resources.length == 0)
-      throw new Error("migrate called for a non-existent source");
-
-    if (aItems != Ci.nsIBrowserProfileMigrator.ALL)
-      resources = resources.filter(r => aItems & r.type);
-
-    // Used to periodically give back control to the main-thread loop.
-    let unblockMainThread = function() {
-      return new Promise(resolve => {
-        Services.tm.mainThread.dispatch(resolve, Ci.nsIThread.DISPATCH_NORMAL);
-      });
-    };
-
-    let getHistogramIdForResourceType = (resourceType, template) => {
-      if (resourceType == MigrationUtils.resourceTypes.HISTORY) {
-        return template.replace("*", "HISTORY");
-      }
-      if (resourceType == MigrationUtils.resourceTypes.BOOKMARKS) {
-        return template.replace("*", "BOOKMARKS");
-      }
-      if (resourceType == MigrationUtils.resourceTypes.PASSWORDS) {
-        return template.replace("*", "LOGINS");
-      }
-      return null;
-    };
-
-    let browserKey = this.getBrowserKey();
-
-    let maybeStartTelemetryStopwatch = resourceType => {
-      let histogramId = getHistogramIdForResourceType(resourceType, "FX_MIGRATION_*_IMPORT_MS");
-      if (histogramId) {
-        TelemetryStopwatch.startKeyed(histogramId, browserKey);
-      }
-      return histogramId;
-    };
-
-    let maybeStartResponsivenessMonitor = resourceType => {
-      let responsivenessMonitor;
-      let responsivenessHistogramId =
-        getHistogramIdForResourceType(resourceType, "FX_MIGRATION_*_JANK_MS");
-      if (responsivenessHistogramId) {
-        responsivenessMonitor = new ResponsivenessMonitor();
-      }
-      return {responsivenessMonitor, responsivenessHistogramId};
-    };
-
-    let maybeFinishResponsivenessMonitor = (responsivenessMonitor, histogramId) => {
-      if (responsivenessMonitor) {
-        let accumulatedDelay = responsivenessMonitor.finish();
-        if (histogramId) {
-          try {
-            Services.telemetry.getKeyedHistogramById(histogramId)
-                    .add(browserKey, accumulatedDelay);
-          } catch (ex) {
-            Cu.reportError(histogramId + ": " + ex);
-          }
-        }
-      }
-    };
-
-    let collectQuantityTelemetry = () => {
-      for (let resourceType of Object.keys(MigrationUtils._importQuantities)) {
-        let histogramId =
-          "FX_MIGRATION_" + resourceType.toUpperCase() + "_QUANTITY";
-        try {
-          Services.telemetry.getKeyedHistogramById(histogramId)
-                  .add(browserKey, MigrationUtils._importQuantities[resourceType]);
-        } catch (ex) {
-          Cu.reportError(histogramId + ": " + ex);
-        }
-      }
-    };
-
-    // Called either directly or through the bookmarks import callback.
-    let doMigrate = Task.async(function*() {
-      let resourcesGroupedByItems = new Map();
-      resources.forEach(function(resource) {
-        if (!resourcesGroupedByItems.has(resource.type)) {
-          resourcesGroupedByItems.set(resource.type, new Set());
-        }
-        resourcesGroupedByItems.get(resource.type).add(resource);
-      });
-
-      if (resourcesGroupedByItems.size == 0)
-        throw new Error("No items to import");
-
-      let notify = function(aMsg, aItemType) {
-        Services.obs.notifyObservers(null, aMsg, aItemType);
-      };
-
-      for (let resourceType of Object.keys(MigrationUtils._importQuantities)) {
-        MigrationUtils._importQuantities[resourceType] = 0;
-      }
-      notify("Migration:Started");
-      for (let [migrationType, itemResources] of resourcesGroupedByItems) {
-        notify("Migration:ItemBeforeMigrate", migrationType);
-
-        let stopwatchHistogramId = maybeStartTelemetryStopwatch(migrationType);
-
-        let {responsivenessMonitor, responsivenessHistogramId} =
-          maybeStartResponsivenessMonitor(migrationType);
-
-        let itemSuccess = false;
-        for (let res of itemResources) {
-          let completeDeferred = PromiseUtils.defer();
-          let resourceDone = function(aSuccess) {
-            itemResources.delete(res);
-            itemSuccess |= aSuccess;
-            if (itemResources.size == 0) {
-              notify(itemSuccess ?
-                     "Migration:ItemAfterMigrate" : "Migration:ItemError",
-                     migrationType);
-              resourcesGroupedByItems.delete(migrationType);
-
-              if (stopwatchHistogramId) {
-                TelemetryStopwatch.finishKeyed(stopwatchHistogramId, browserKey);
-              }
-
-              maybeFinishResponsivenessMonitor(responsivenessMonitor, responsivenessHistogramId);
-
-              if (resourcesGroupedByItems.size == 0) {
-                collectQuantityTelemetry();
-                notify("Migration:Ended");
-              }
-            }
-            completeDeferred.resolve();
-          };
-
-          // If migrate throws, an error occurred, and the callback
-          // (itemMayBeDone) might haven't been called.
-          try {
-            res.migrate(resourceDone);
-          } catch (ex) {
-            Cu.reportError(ex);
-            resourceDone(false);
-          }
-
-          // Certain resources must be ran sequentially or they could fail,
-          // for example bookmarks and history (See bug 1272652).
-          if (migrationType == MigrationUtils.resourceTypes.BOOKMARKS ||
-              migrationType == MigrationUtils.resourceTypes.HISTORY) {
-            yield completeDeferred.promise;
-          }
-
-          yield unblockMainThread();
-        }
-      }
-    });
-
-    if (MigrationUtils.isStartupMigration && !this.startupOnlyMigrator) {
-      MigrationUtils.profileStartup.doStartup();
-      // First import the default bookmarks.
-      // Note: We do not need to do so for the Firefox migrator
-      // (=startupOnlyMigrator), as it just copies over the places database
-      // from another profile.
-      Task.spawn(function* () {
-        // Tell nsBrowserGlue we're importing default bookmarks.
-        let browserGlue = Cc["@mozilla.org/browser/browserglue;1"].
-                          getService(Ci.nsIObserver);
-        browserGlue.observe(null, TOPIC_WILL_IMPORT_BOOKMARKS, "");
-
-        // Import the default bookmarks. We ignore whether or not we succeed.
-        yield BookmarkHTMLUtils.importFromURL(
-          "chrome://browser/locale/bookmarks.html", true).catch(r => r);
-
-        // We'll tell nsBrowserGlue we've imported bookmarks, but before that
-        // we need to make sure we're going to know when it's finished
-        // initializing places:
-        let placesInitedPromise = new Promise(resolve => {
-          let onPlacesInited = function() {
-            Services.obs.removeObserver(onPlacesInited, TOPIC_PLACES_DEFAULTS_FINISHED);
-            resolve();
-          };
-          Services.obs.addObserver(onPlacesInited, TOPIC_PLACES_DEFAULTS_FINISHED, false);
-        });
-        browserGlue.observe(null, TOPIC_DID_IMPORT_BOOKMARKS, "");
-        yield placesInitedPromise;
-        doMigrate();
-      });
-      return;
-    }
-    doMigrate();
-  },
-
-  /**
-   * DO NOT OVERRIDE - After deCOMing migration, this code
-   * won't be part of the migrator itself.
-   *
-   * @see nsIBrowserProfileMigrator
-   */
-  get sourceExists() {
-    if (this.startupOnlyMigrator && !MigrationUtils.isStartupMigration)
-      return false;
-
-    // For a single-profile source, check if any data is available.
-    // For multiple-profiles source, make sure that at least one
-    // profile is available.
-    let exists = false;
-    try {
-      let profiles = this.sourceProfiles;
-      if (!profiles) {
-        let resources = this._getMaybeCachedResources("");
-        if (resources && resources.length > 0)
-          exists = true;
-      } else {
-        exists = profiles.length > 0;
-      }
-    } catch (ex) {
-      Cu.reportError(ex);
-    }
-    return exists;
-  },
-
-  /** * PRIVATE STUFF - DO NOT OVERRIDE ***/
-  _getMaybeCachedResources: function PMB__getMaybeCachedResources(aProfile) {
-    let profileKey = aProfile ? aProfile.id : "";
-    if (this._resourcesByProfile) {
-      if (profileKey in this._resourcesByProfile)
-        return this._resourcesByProfile[profileKey];
-    } else {
-      this._resourcesByProfile = { };
-    }
-    this._resourcesByProfile[profileKey] = this.getResources(aProfile);
-    return this._resourcesByProfile[profileKey];
-  }
-};
-
-this.MigrationUtils = Object.freeze({
-  resourceTypes: {
-    SETTINGS:   Ci.nsIBrowserProfileMigrator.SETTINGS,
-    COOKIES:    Ci.nsIBrowserProfileMigrator.COOKIES,
-    HISTORY:    Ci.nsIBrowserProfileMigrator.HISTORY,
-    FORMDATA:   Ci.nsIBrowserProfileMigrator.FORMDATA,
-    PASSWORDS:  Ci.nsIBrowserProfileMigrator.PASSWORDS,
-    BOOKMARKS:  Ci.nsIBrowserProfileMigrator.BOOKMARKS,
-    OTHERDATA:  Ci.nsIBrowserProfileMigrator.OTHERDATA,
-    SESSION:    Ci.nsIBrowserProfileMigrator.SESSION,
-  },
-
-  /**
-   * Helper for implementing simple asynchronous cases of migration resources'
-   * |migrate(aCallback)| (see MigratorPrototype).  If your |migrate| method
-   * just waits for some file to be read, for example, and then migrates
-   * everything right away, you can wrap the async-function with this helper
-   * and not worry about notifying the callback.
-   *
-   * For example, instead of writing:
-   * setTimeout(function() {
-   *   try {
-   *     ....
-   *     aCallback(true);
-   *   }
-   *   catch() {
-   *     aCallback(false);
-   *   }
-   * }, 0);
-   *
-   * You may write:
-   * setTimeout(MigrationUtils.wrapMigrateFunction(function() {
-   *   if (importingFromMosaic)
-   *     throw Cr.NS_ERROR_UNEXPECTED;
-   * }, aCallback), 0);
-   *
-   * ... and aCallback will be called with aSuccess=false when importing
-   * from Mosaic, or with aSuccess=true otherwise.
-   *
-   * @param aFunction
-   *        the function that will be called sometime later.  If aFunction
-   *        throws when it's called, aCallback(false) is called, otherwise
-   *        aCallback(true) is called.
-   * @param aCallback
-   *        the callback function passed to |migrate|.
-   * @return the wrapped function.
-   */
-  wrapMigrateFunction: function MU_wrapMigrateFunction(aFunction, aCallback) {
-    return function() {
-      let success = false;
-      try {
-        aFunction.apply(null, arguments);
-        success = true;
-      } catch (ex) {
-        Cu.reportError(ex);
-      }
-      // Do not change this to call aCallback directly in try try & catch
-      // blocks, because if aCallback throws, we may end up calling aCallback
-      // twice.
-      aCallback(success);
-    };
-  },
-
-  /**
-   * Gets a string from the migration bundle.  Shorthand for
-   * nsIStringBundle.GetStringFromName, if aReplacements isn't passed, or for
-   * nsIStringBundle.formatStringFromName if it is.
-   *
-   * This method also takes care of "bumped" keys (See bug 737381 comment 8 for
-   * details).
-   *
-   * @param aKey
-   *        The key of the string to retrieve.
-   * @param aReplacements
-   *        [optioanl] Array of replacements to run on the retrieved string.
-   * @return the retrieved string.
-   *
-   * @see nsIStringBundle
-   */
-  getLocalizedString: function MU_getLocalizedString(aKey, aReplacements) {
-    aKey = aKey.replace(/_(canary|chromium)$/, "_chrome");
-
-    const OVERRIDES = {
-      "4_firefox": "4_firefox_history_and_bookmarks",
-      "64_firefox": "64_firefox_other"
-    };
-    aKey = OVERRIDES[aKey] || aKey;
-
-    if (aReplacements === undefined)
-      return getMigrationBundle().GetStringFromName(aKey);
-    return getMigrationBundle().formatStringFromName(
-      aKey, aReplacements, aReplacements.length);
-  },
-
-  _getLocalePropertyForBrowser(browserId) {
-    switch (browserId) {
-      case "edge":
-        return "sourceNameEdge";
-      case "ie":
-        return "sourceNameIE";
-      case "safari":
-        return "sourceNameSafari";
-      case "canary":
-        return "sourceNameCanary";
-      case "chrome":
-        return "sourceNameChrome";
-      case "chromium":
-        return "sourceNameChromium";
-      case "firefox":
-        return "sourceNameFirefox";
-      case "360se":
-        return "sourceName360se";
-    }
-    return null;
-  },
-
-  getBrowserName(browserId) {
-    let prop = this._getLocalePropertyForBrowser(browserId);
-    if (prop) {
-      return this.getLocalizedString(prop);
-    }
-    return null;
-  },
-
-  /**
-   * Helper for creating a folder for imported bookmarks from a particular
-   * migration source.  The folder is created at the end of the given folder.
-   *
-   * @param sourceNameStr
-   *        the source name (first letter capitalized).  This is used
-   *        for reading the localized source name from the migration
-   *        bundle (e.g. if aSourceNameStr is Mosaic, this will try to read
-   *        sourceNameMosaic from the migration bundle).
-   * @param parentGuid
-   *        the GUID of the folder in which the new folder should be created.
-   * @return the GUID of the new folder.
-   */
-  createImportedBookmarksFolder: Task.async(function* (sourceNameStr, parentGuid) {
-    let source = this.getLocalizedString("sourceName" + sourceNameStr);
-    let title = this.getLocalizedString("importedBookmarksFolder", [source]);
-    return (yield PlacesUtils.bookmarks.insert({
-      type: PlacesUtils.bookmarks.TYPE_FOLDER, parentGuid, title
-    })).guid;
-  }),
-
-  /**
-   * Get all the rows corresponding to a select query from a database, without
-   * requiring a lock on the database. If fetching data fails (because someone
-   * else tried to write to the DB at the same time, for example), we will
-   * retry the fetch after a 100ms timeout, up to 10 times.
-   *
-   * @param path
-   *        the file path to the database we want to open.
-   * @param description
-   *        a developer-readable string identifying what kind of database we're
-   *        trying to open.
-   * @param selectQuery
-   *        the SELECT query to use to fetch the rows.
-   *
-   * @return a promise that resolves to an array of rows. The promise will be
-   *         rejected if the read/fetch failed even after retrying.
-   */
-  getRowsFromDBWithoutLocks(path, description, selectQuery) {
-    let dbOptions = {
-      readOnly: true,
-      ignoreLockingMode: true,
-      path,
-    };
-
-    const RETRYLIMIT = 10;
-    const RETRYINTERVAL = 100;
-    return Task.spawn(function* innerGetRows() {
-      let rows = null;
-      for (let retryCount = RETRYLIMIT; retryCount && !rows; retryCount--) {
-        // Attempt to get the rows. If this succeeds, we will bail out of the loop,
-        // close the database in a failsafe way, and pass the rows back.
-        // If fetching the rows throws, we will wait RETRYINTERVAL ms
-        // and try again. This will repeat a maximum of RETRYLIMIT times.
-        let db;
-        let didOpen = false;
-        let exceptionSeen;
-        try {
-          db = yield Sqlite.openConnection(dbOptions);
-          didOpen = true;
-          rows = yield db.execute(selectQuery);
-        } catch (ex) {
-          if (!exceptionSeen) {
-            Cu.reportError(ex);
-          }
-          exceptionSeen = ex;
-        } finally {
-          try {
-            if (didOpen) {
-              yield db.close();
-            }
-          } catch (ex) {}
-        }
-        if (exceptionSeen) {
-          yield new Promise(resolve => setTimeout(resolve, RETRYINTERVAL));
-        }
-      }
-      if (!rows) {
-        throw new Error("Couldn't get rows from the " + description + " database.");
-      }
-      return rows;
-    });
-  },
-
-  get _migrators() {
-    if (!gMigrators) {
-      gMigrators = new Map();
-    }
-    return gMigrators;
-  },
-
-  /*
-   * Returns the migrator for the given source, if any data is available
-   * for this source, or null otherwise.
-   *
-   * @param aKey internal name of the migration source.
-   *             Supported values: ie (windows),
-   *                               edge (windows),
-   *                               safari (mac),
-   *                               canary (mac/windows),
-   *                               chrome (mac/windows/linux),
-   *                               chromium (mac/windows/linux),
-   *                               360se (windows),
-   *                               firefox.
-   *
-   * If null is returned,  either no data can be imported
-   * for the given migrator, or aMigratorKey is invalid  (e.g. ie on mac,
-   * or mosaic everywhere).  This method should be used rather than direct
-   * getService for future compatibility (see bug 718280).
-   *
-   * @return profile migrator implementing nsIBrowserProfileMigrator, if it can
-   *         import any data, null otherwise.
-   */
-  getMigrator: function MU_getMigrator(aKey) {
-    let migrator = null;
-    if (this._migrators.has(aKey)) {
-      migrator = this._migrators.get(aKey);
-    } else {
-      try {
-        migrator = Cc["@mozilla.org/profile/migrator;1?app=browser&type=" +
-                      aKey].createInstance(Ci.nsIBrowserProfileMigrator);
-      } catch (ex) { Cu.reportError(ex) }
-      this._migrators.set(aKey, migrator);
-    }
-
-    try {
-      return migrator && migrator.sourceExists ? migrator : null;
-    } catch (ex) { Cu.reportError(ex); return null }
-  },
-
-  /**
-   * Figure out what is the default browser, and if there is a migrator
-   * for it, return that migrator's internal name.
-   * For the time being, the "internal name" of a migrator is its contract-id
-   * trailer (e.g. ie for @mozilla.org/profile/migrator;1?app=browser&type=ie),
-   * but it will soon be exposed properly.
-   */
-  getMigratorKeyForDefaultBrowser() {
-    // Canary uses the same description as Chrome so we can't distinguish them.
-    const APP_DESC_TO_KEY = {
-      "Internet Explorer":                 "ie",
-      "Microsoft Edge":                    "edge",
-      "Safari":                            "safari",
-      "Basilisk":                          "firefox",
-      "Firefox":                           "firefox",
-      "Nightly":                           "firefox",
-      "Google Chrome":                     "chrome",  // Windows, Linux
-      "Chrome":                            "chrome",  // OS X
-      "Chromium":                          "chromium", // Windows, OS X
-      "Chromium Web Browser":              "chromium", // Linux
-      "360\u5b89\u5168\u6d4f\u89c8\u5668": "360se",
-    };
-
-    let key = "";
-    try {
-      let browserDesc =
-        Cc["@mozilla.org/uriloader/external-protocol-service;1"]
-          .getService(Ci.nsIExternalProtocolService)
-          .getApplicationDescription("http");
-      key = APP_DESC_TO_KEY[browserDesc] || "";
-      // Handle devedition, as well as "FirefoxNightly" on OS X.
-      if (!key && browserDesc.startsWith("Firefox")) {
-        key = "firefox";
-      }
-    } catch (ex) {
-      Cu.reportError("Could not detect default browser: " + ex);
-    }
-
-#ifdef XP_WIN
-    // "firefox" is the least useful entry here, and might just be because we've set
-    // ourselves as the default (on Windows 7 and below). In that case, check if we
-    // have a registry key that tells us where to go:
-    if (key == "firefox" && Services.vc.compare(Services.sysinfo.getProperty("version"), "6.2") >= 0) {
-      // Because we remove the registry key, reading the registry key only works once.
-      // We save the value for subsequent calls to avoid hard-to-trace bugs when multiple
-      // consumers ask for this key.
-      if (gPreviousDefaultBrowserKey) {
-        key = gPreviousDefaultBrowserKey;
-      } else {
-        // We didn't have a saved value, so check the registry.
-        const kRegPath = "Software\\Mozilla\\Firefox";
-        let oldDefault = WindowsRegistry.readRegKey(
-            Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER, kRegPath, "OldDefaultBrowserCommand");
-        if (oldDefault) {
-          // Remove the key:
-          WindowsRegistry.removeRegKey(
-            Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER, kRegPath, "OldDefaultBrowserCommand");
-          try {
-            let file = Cc["@mozilla.org/file/local;1"].createInstance(Ci.nsILocalFileWin);
-            file.initWithCommandLine(oldDefault);
-            key = APP_DESC_TO_KEY[file.getVersionInfoField("FileDescription")] || key;
-            // Save the value for future callers.
-            gPreviousDefaultBrowserKey = key;
-          } catch (ex) {
-            Cu.reportError("Could not convert old default browser value to description.");
-          }
-        }
-      }
-    }
-#endif
-
-    return key;
-  },
-
-  // Whether or not we're in the process of startup migration
-  get isStartupMigration() {
-    return gProfileStartup != null;
-  },
-
-  /**
-   * In the case of startup migration, this is set to the nsIProfileStartup
-   * instance passed to ProfileMigrator's migrate.
-   *
-   * @see showMigrationWizard
-   */
-  get profileStartup() {
-    return gProfileStartup;
-  },
-
-  /**
-   * Show the migration wizard.  On mac, this may just focus the wizard if it's
-   * already running, in which case aOpener and aParams are ignored.
-   *
-   * @param {Window} [aOpener]
-   *        optional; the window that asks to open the wizard.
-   * @param {Array} [aParams]
-   *        optional arguments for the migration wizard, in the form of an array
-   *        This is passed as-is for the params argument of
-   *        nsIWindowWatcher.openWindow. The array elements we expect are, in
-   *        order:
-   *        - {Number} migration entry point constant (see below)
-   *        - {String} source browser identifier
-   *        - {nsIBrowserProfileMigrator} actual migrator object
-   *        - {Boolean} whether this is a startup migration
-   *        - {Boolean} whether to skip the 'source' page
-   *        - {String} an identifier for the profile to use when migrating
-   *        NB: If you add new consumers, please add a migration entry point
-   *        constant below, and specify at least the first element of the array
-   *        (the migration entry point for purposes of telemetry).
-   */
-  showMigrationWizard:
-  function MU_showMigrationWizard(aOpener, aParams) {
-    let features = "chrome,dialog,modal,centerscreen,titlebar,resizable=no";
-#ifdef XP_MACOSX
-    if (!this.isStartupMigration) {
-      let win = Services.wm.getMostRecentWindow("Browser:MigrationWizard");
-      if (win) {
-        win.focus();
-        return;
-      }
-      // On mac, the migration wiazrd should only be modal in the case of
-      // startup-migration.
-      features = "centerscreen,chrome,resizable=no";
-    }
-#endif
-
-    // nsIWindowWatcher doesn't deal with raw arrays, so we convert the input
-    let params;
-    if (Array.isArray(aParams)) {
-      params = Cc["@mozilla.org/array;1"].createInstance(Ci.nsIMutableArray);
-      for (let item of aParams) {
-        let comtaminatedVal;
-        if (item && item instanceof Ci.nsISupports) {
-          comtaminatedVal = item;
-        } else {
-          switch (typeof item) {
-            case "boolean":
-              comtaminatedVal = Cc["@mozilla.org/supports-PRBool;1"].
-                                createInstance(Ci.nsISupportsPRBool);
-              comtaminatedVal.data = item;
-              break;
-            case "number":
-              comtaminatedVal = Cc["@mozilla.org/supports-PRUint32;1"].
-                                createInstance(Ci.nsISupportsPRUint32);
-              comtaminatedVal.data = item;
-              break;
-            case "string":
-              comtaminatedVal = Cc["@mozilla.org/supports-cstring;1"].
-                                createInstance(Ci.nsISupportsCString);
-              comtaminatedVal.data = item;
-              break;
-
-            case "undefined":
-            case "object":
-              if (!item) {
-                comtaminatedVal = null;
-                break;
-              }
-              /* intentionally falling through to error out here for
-                 non-null/undefined things: */
-            default:
-              throw new Error("Unexpected parameter type " + (typeof item) + ": " + item);
-          }
-        }
-        params.appendElement(comtaminatedVal, false);
-      }
-    } else {
-      params = aParams;
-    }
-
-    Services.ww.openWindow(aOpener,
-                           "chrome://browser/content/migration/migration.xul",
-                           "_blank",
-                           features,
-                           params);
-  },
-
-  /**
-   * Show the migration wizard for startup-migration.  This should only be
-   * called by ProfileMigrator (see ProfileMigrator.js), which implements
-   * nsIProfileMigrator.
-   *
-   * @param aProfileStartup
-   *        the nsIProfileStartup instance provided to ProfileMigrator.migrate.
-   * @param [optional] aMigratorKey
-   *        If set, the migration wizard will import from the corresponding
-   *        migrator, bypassing the source-selection page.  Otherwise, the
-   *        source-selection page will be displayed, either with the default
-   *        browser selected, if it could be detected and if there is a
-   *        migrator for it, or with the first option selected as a fallback
-   *        (The first option is hardcoded to be the most common browser for
-   *         the OS we run on.  See migration.xul).
-   * @param [optional] aProfileToMigrate
-   *        If set, the migration wizard will import from the profile indicated.
-   * @throws if aMigratorKey is invalid or if it points to a non-existent
-   *         source.
-   */
-  startupMigration:
-  function MU_startupMigrator(aProfileStartup, aMigratorKey, aProfileToMigrate) {
-    if (!aProfileStartup) {
-      throw new Error("an profile-startup instance is required for startup-migration");
-    }
-    gProfileStartup = aProfileStartup;
-
-    let skipSourcePage = false, migrator = null, migratorKey = "";
-    if (aMigratorKey) {
-      migrator = this.getMigrator(aMigratorKey);
-      if (!migrator) {
-        // aMigratorKey must point to a valid source, so, if it doesn't
-        // cleanup and throw.
-        this.finishMigration();
-        throw new Error("startMigration was asked to open auto-migrate from " +
-                        "a non-existent source: " + aMigratorKey);
-      }
-      migratorKey = aMigratorKey;
-      skipSourcePage = true;
-    } else {
-      let defaultBrowserKey = this.getMigratorKeyForDefaultBrowser();
-      if (defaultBrowserKey) {
-        migrator = this.getMigrator(defaultBrowserKey);
-        if (migrator)
-          migratorKey = defaultBrowserKey;
-      }
-    }
-
-    if (!migrator) {
-      // If there's no migrator set so far, ensure that there is at least one
-      // migrator available before opening the wizard.
-      // Note that we don't need to check the default browser first, because
-      // if that one existed we would have used it in the block above this one.
-      if (!gAvailableMigratorKeys.some(key => !!this.getMigrator(key))) {
-        // None of the keys produced a usable migrator, so finish up here:
-        this.finishMigration();
-        return;
-      }
-    }
-
-    let isRefresh = migrator && skipSourcePage &&
-                    migratorKey == "@MOZ_APP_NAME@";
-
-    if (!isRefresh && AutoMigrate.enabled) {
-      try {
-        AutoMigrate.migrate(aProfileStartup, migratorKey, aProfileToMigrate);
-        return;
-      } catch (ex) {
-        // If automigration failed, continue and show the dialog.
-        Cu.reportError(ex);
-      }
-    }
-
-    let migrationEntryPoint = this.MIGRATION_ENTRYPOINT_FIRSTRUN;
-    if (isRefresh) {
-      migrationEntryPoint = this.MIGRATION_ENTRYPOINT_FXREFRESH;
-    }
-
-    let params = [
-      migrationEntryPoint,
-      migratorKey,
-      migrator,
-      aProfileStartup,
-      skipSourcePage,
-      aProfileToMigrate,
-    ];
-    this.showMigrationWizard(null, params);
-  },
-
-  _importQuantities: {
-    bookmarks: 0,
-    logins: 0,
-    history: 0,
-  },
-
-  insertBookmarkWrapper(bookmark) {
-    this._importQuantities.bookmarks++;
-    let insertionPromise = PlacesUtils.bookmarks.insert(bookmark);
-    if (!gKeepUndoData) {
-      return insertionPromise;
-    }
-    // If we keep undo data, add a promise handler that stores the undo data once
-    // the bookmark has been inserted in the DB, and then returns the bookmark.
-    let {parentGuid} = bookmark;
-    return insertionPromise.then(bm => {
-      let {guid, lastModified, type} = bm;
-      gUndoData.get("bookmarks").push({
-        parentGuid, guid, lastModified, type
-      });
-      return bm;
-    });
-  },
-
-  insertManyBookmarksWrapper(bookmarks, parent) {
-    let insertionPromise = PlacesUtils.bookmarks.insertTree({guid: parent, children: bookmarks});
-    return insertionPromise.then(insertedItems => {
-      this._importQuantities.bookmarks += insertedItems.length;
-      if (gKeepUndoData) {
-        let bmData = gUndoData.get("bookmarks");
-        for (let bm of insertedItems) {
-          let {parentGuid, guid, lastModified, type} = bm;
-          bmData.push({parentGuid, guid, lastModified, type});
-        }
-      }
-    }, ex => Cu.reportError(ex));
-  },
-
-  insertVisitsWrapper(places, options) {
-    this._importQuantities.history += places.length;
-    if (gKeepUndoData) {
-      this._updateHistoryUndo(places);
-    }
-    return PlacesUtils.asyncHistory.updatePlaces(places, options, true);
-  },
-
-  insertLoginWrapper(login) {
-    this._importQuantities.logins++;
-    let insertedLogin = LoginHelper.maybeImportLogin(login);
-    // Note that this means that if we import a login that has a newer password
-    // than we know about, we will update the login, and an undo of the import
-    // will not revert this. This seems preferable over removing the login
-    // outright or storing the old password in the undo file.
-    if (insertedLogin && gKeepUndoData) {
-      let {guid, timePasswordChanged} = insertedLogin;
-      gUndoData.get("logins").push({guid, timePasswordChanged});
-    }
-  },
-
-  initializeUndoData() {
-    gKeepUndoData = true;
-    gUndoData = new Map([["bookmarks", []], ["visits", []], ["logins", []]]);
-  },
-
-  _postProcessUndoData: Task.async(function*(state) {
-    if (!state) {
-      return state;
-    }
-    let bookmarkFolders = state.get("bookmarks").filter(b => b.type == PlacesUtils.bookmarks.TYPE_FOLDER);
-
-    let bookmarkFolderData = [];
-    let bmPromises = bookmarkFolders.map(({guid}) => {
-      // Ignore bookmarks where the promise doesn't resolve (ie that are missing)
-      // Also check that the bookmark fetch returns isn't null before adding it.
-      return PlacesUtils.bookmarks.fetch(guid).then(bm => bm && bookmarkFolderData.push(bm), () => {});
-    });
-
-    yield Promise.all(bmPromises);
-    let folderLMMap = new Map(bookmarkFolderData.map(b => [b.guid, b.lastModified]));
-    for (let bookmark of bookmarkFolders) {
-      let lastModified = folderLMMap.get(bookmark.guid);
-      // If the bookmark was deleted, the map will be returning null, so check:
-      if (lastModified) {
-        bookmark.lastModified = lastModified;
-      }
-    }
-    return state;
-  }),
-
-  stopAndRetrieveUndoData() {
-    let undoData = gUndoData;
-    gUndoData = null;
-    gKeepUndoData = false;
-    return this._postProcessUndoData(undoData);
-  },
-
-  _updateHistoryUndo(places) {
-    let visits = gUndoData.get("visits");
-    let visitMap = new Map(visits.map(v => [v.url, v]));
-    for (let place of places) {
-      let visitCount = place.visits.length;
-      let first, last;
-      if (visitCount > 1) {
-        let visitDates = place.visits.map(v => v.visitDate);
-        first = Math.min.apply(Math, visitDates);
-        last = Math.max.apply(Math, visitDates);
-      } else {
-        first = last = place.visits[0].visitDate;
-      }
-      let url = place.uri.spec;
-      try {
-        new URL(url);
-      } catch (ex) {
-        // This won't save and we won't need to 'undo' it, so ignore this URL.
-        continue;
-      }
-      if (!visitMap.has(url)) {
-        visitMap.set(url, {url, visitCount, first, last});
-      } else {
-        let currentData = visitMap.get(url);
-        currentData.visitCount += visitCount;
-        currentData.first = Math.min(currentData.first, first);
-        currentData.last = Math.max(currentData.last, last);
-      }
-    }
-    gUndoData.set("visits", Array.from(visitMap.values()));
-  },
-
-  /**
-   * Cleans up references to migrators and nsIProfileInstance instances.
-   */
-  finishMigration: function MU_finishMigration() {
-    gMigrators = null;
-    gProfileStartup = null;
-    gMigrationBundle = null;
-  },
-
-  gAvailableMigratorKeys,
-
-  MIGRATION_ENTRYPOINT_UNKNOWN: 0,
-  MIGRATION_ENTRYPOINT_FIRSTRUN: 1,
-  MIGRATION_ENTRYPOINT_FXREFRESH: 2,
-  MIGRATION_ENTRYPOINT_PLACES: 3,
-  MIGRATION_ENTRYPOINT_PASSWORDS: 4,
-
-  _sourceNameToIdMapping: {
-    "nothing":    1,
-    "firefox":    2,
-    "edge":       3,
-    "ie":         4,
-    "chrome":     5,
-    "chromium":   6,
-    "canary":     7,
-    "safari":     8,
-    "360se":      9,
-  },
-  getSourceIdForTelemetry(sourceName) {
-    return this._sourceNameToIdMapping[sourceName] || 0;
-  },
-});