Issue #303 Part 1: Move basilisk files from /browser to /application/basilisk

1 files changed, 0 insertions, 670 deletions

diff --git a/browser/components/migration/AutoMigrate.jsm b/browser/components/migration/AutoMigrate.jsm
deleted file mode 100644
index b38747825..000000000
--- a/browser/components/migration/AutoMigrate.jsm
+++ /dev/null
@@ -1,670 +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/. */
-
-"use strict";
-
-this.EXPORTED_SYMBOLS = ["AutoMigrate"];
-
-const { classes: Cc, interfaces: Ci, results: Cr, utils: Cu } = Components;
-
-const kAutoMigrateEnabledPref = "browser.migrate.automigrate.enabled";
-const kUndoUIEnabledPref = "browser.migrate.automigrate.ui.enabled";
-
-const kAutoMigrateBrowserPref = "browser.migrate.automigrate.browser";
-const kAutoMigrateImportedItemIds = "browser.migrate.automigrate.imported-items";
-
-const kAutoMigrateLastUndoPromptDateMsPref = "browser.migrate.automigrate.lastUndoPromptDateMs";
-const kAutoMigrateDaysToOfferUndoPref = "browser.migrate.automigrate.daysToOfferUndo";
-
-const kAutoMigrateUndoSurveyPref = "browser.migrate.automigrate.undo-survey";
-const kAutoMigrateUndoSurveyLocalePref = "browser.migrate.automigrate.undo-survey-locales";
-
-const kNotificationId = "automigration-undo";
-
-Cu.import("resource:///modules/MigrationUtils.jsm");
-Cu.import("resource://gre/modules/Preferences.jsm");
-Cu.import("resource://gre/modules/Services.jsm");
-Cu.import("resource://gre/modules/Task.jsm");
-Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "AsyncShutdown",
-                                  "resource://gre/modules/AsyncShutdown.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "LoginHelper",
-                                  "resource://gre/modules/LoginHelper.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "NewTabUtils",
-                                  "resource://gre/modules/NewTabUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "OS",
-                                  "resource://gre/modules/osfile.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
-                                  "resource://gre/modules/PlacesUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "TelemetryStopwatch",
-                                  "resource://gre/modules/TelemetryStopwatch.jsm");
-
-XPCOMUtils.defineLazyGetter(this, "gBrandBundle", function() {
-  const kBrandBundle = "chrome://branding/locale/brand.properties";
-  return Services.strings.createBundle(kBrandBundle);
-});
-
-XPCOMUtils.defineLazyGetter(this, "gHardcodedStringBundle", function() {
-  const kBundleURI = "chrome://browser/content/migration/extra-migration-strings.properties";
-  return Services.strings.createBundle(kBundleURI);
-});
-
-Cu.importGlobalProperties(["URL"]);
-
-/* globals kUndoStateFullPath */
-XPCOMUtils.defineLazyGetter(this, "kUndoStateFullPath", function() {
-  return OS.Path.join(OS.Constants.Path.profileDir, "initialMigrationMetadata.jsonlz4");
-});
-
-const AutoMigrate = {
-  get resourceTypesToUse() {
-    let {BOOKMARKS, HISTORY, PASSWORDS} = Ci.nsIBrowserProfileMigrator;
-    return BOOKMARKS | HISTORY | PASSWORDS;
-  },
-
-  _checkIfEnabled() {
-    let pref = Preferences.get(kAutoMigrateEnabledPref, false);
-    // User-set values should take precedence:
-    if (Services.prefs.prefHasUserValue(kAutoMigrateEnabledPref)) {
-      return pref;
-    }
-    // If we're using the default value, make sure the distribution.ini
-    // value is taken into account even early on startup.
-    try {
-      let distributionFile = Services.dirsvc.get("XREAppDist", Ci.nsIFile);
-      distributionFile.append("distribution.ini");
-      let parser = Cc["@mozilla.org/xpcom/ini-parser-factory;1"].
-                 getService(Ci.nsIINIParserFactory).
-                 createINIParser(distributionFile);
-      return JSON.parse(parser.getString("Preferences", kAutoMigrateEnabledPref));
-    } catch (ex) { /* ignore exceptions (file doesn't exist, invalid value, etc.) */ }
-
-    return pref;
-  },
-
-  init() {
-    this.enabled = this._checkIfEnabled();
-  },
-
-  /**
-   * Automatically pick a migrator and resources to migrate,
-   * then migrate those and start up.
-   *
-   * @throws if automatically deciding on migrators/data
-   *         failed for some reason.
-   */
-  migrate(profileStartup, migratorKey, profileToMigrate) {
-    let histogram = Services.telemetry.getHistogramById(
-      "FX_STARTUP_MIGRATION_AUTOMATED_IMPORT_PROCESS_SUCCESS");
-    histogram.add(0);
-    let {migrator, pickedKey} = this.pickMigrator(migratorKey);
-    histogram.add(5);
-
-    profileToMigrate = this.pickProfile(migrator, profileToMigrate);
-    histogram.add(10);
-
-    let resourceTypes = migrator.getMigrateData(profileToMigrate, profileStartup);
-    if (!(resourceTypes & this.resourceTypesToUse)) {
-      throw new Error("No usable resources were found for the selected browser!");
-    }
-    histogram.add(15);
-
-    let sawErrors = false;
-    let migrationObserver = (subject, topic) => {
-      if (topic == "Migration:ItemError") {
-        sawErrors = true;
-      } else if (topic == "Migration:Ended") {
-        histogram.add(25);
-        if (sawErrors) {
-          histogram.add(26);
-        }
-        Services.obs.removeObserver(migrationObserver, "Migration:Ended");
-        Services.obs.removeObserver(migrationObserver, "Migration:ItemError");
-        Services.prefs.setCharPref(kAutoMigrateBrowserPref, pickedKey);
-        // Save the undo history and block shutdown on that save completing.
-        AsyncShutdown.profileBeforeChange.addBlocker(
-          "AutoMigrate Undo saving", this.saveUndoState(), () => {
-            return {state: this._saveUndoStateTrackerForShutdown};
-          });
-      }
-    };
-
-    MigrationUtils.initializeUndoData();
-    Services.obs.addObserver(migrationObserver, "Migration:Ended", false);
-    Services.obs.addObserver(migrationObserver, "Migration:ItemError", false);
-    migrator.migrate(this.resourceTypesToUse, profileStartup, profileToMigrate);
-    histogram.add(20);
-  },
-
-  /**
-   * Pick and return a migrator to use for automatically migrating.
-   *
-   * @param {String} migratorKey   optional, a migrator key to prefer/pick.
-   * @returns {Object}             an object with the migrator to use for migrating, as
-   *                               well as the key we eventually ended up using to obtain it.
-   */
-  pickMigrator(migratorKey) {
-    if (!migratorKey) {
-      let defaultKey = MigrationUtils.getMigratorKeyForDefaultBrowser();
-      if (!defaultKey) {
-        throw new Error("Could not determine default browser key to migrate from");
-      }
-      migratorKey = defaultKey;
-    }
-    if (migratorKey == "firefox") {
-      throw new Error("Can't automatically migrate from Firefox.");
-    }
-
-    let migrator = MigrationUtils.getMigrator(migratorKey);
-    if (!migrator) {
-      throw new Error("Migrator specified or a default was found, but the migrator object is not available (or has no data).");
-    }
-    return {migrator, pickedKey: migratorKey};
-  },
-
-  /**
-   * Pick a source profile (from the original browser) to use.
-   *
-   * @param {Migrator} migrator     the migrator object to use
-   * @param {String}   suggestedId  the id of the profile to migrate, if pre-specified, or null
-   * @returns                       the profile to migrate, or null if migrating
-   *                                from the default profile.
-   */
-  pickProfile(migrator, suggestedId) {
-    let profiles = migrator.sourceProfiles;
-    if (profiles && !profiles.length) {
-      throw new Error("No profile data found to migrate.");
-    }
-    if (suggestedId) {
-      if (!profiles) {
-        throw new Error("Profile specified but only a default profile found.");
-      }
-      let suggestedProfile = profiles.find(profile => profile.id == suggestedId);
-      if (!suggestedProfile) {
-        throw new Error("Profile specified was not found.");
-      }
-      return suggestedProfile;
-    }
-    if (profiles && profiles.length > 1) {
-      throw new Error("Don't know how to pick a profile when more than 1 profile is present.");
-    }
-    return profiles ? profiles[0] : null;
-  },
-
-  _pendingUndoTasks: false,
-  canUndo: Task.async(function* () {
-    if (this._savingPromise) {
-      yield this._savingPromise;
-    }
-    if (this._pendingUndoTasks) {
-      return false;
-    }
-    let fileExists = false;
-    try {
-      fileExists = yield OS.File.exists(kUndoStateFullPath);
-    } catch (ex) {
-      Cu.reportError(ex);
-    }
-    return fileExists;
-  }),
-
-  undo: Task.async(function* () {
-    let browserId = Preferences.get(kAutoMigrateBrowserPref, "unknown");
-    TelemetryStopwatch.startKeyed("FX_STARTUP_MIGRATION_UNDO_TOTAL_MS", browserId);
-    let histogram = Services.telemetry.getHistogramById("FX_STARTUP_MIGRATION_AUTOMATED_IMPORT_UNDO");
-    histogram.add(0);
-    if (!(yield this.canUndo())) {
-      histogram.add(5);
-      throw new Error("Can't undo!");
-    }
-
-    this._pendingUndoTasks = true;
-    this._removeNotificationBars();
-    histogram.add(10);
-
-    let readPromise = OS.File.read(kUndoStateFullPath, {
-      encoding: "utf-8",
-      compression: "lz4",
-    });
-    let stateData = this._dejsonifyUndoState(yield readPromise);
-    histogram.add(12);
-
-    this._errorMap = {bookmarks: 0, visits: 0, logins: 0};
-    let reportErrorTelemetry = (type) => {
-      let histogramId = `FX_STARTUP_MIGRATION_UNDO_${type.toUpperCase()}_ERRORCOUNT`;
-      Services.telemetry.getKeyedHistogramById(histogramId).add(browserId, this._errorMap[type]);
-    };
-
-    let startTelemetryStopwatch = resourceType => {
-      let histogramId = `FX_STARTUP_MIGRATION_UNDO_${resourceType.toUpperCase()}_MS`;
-      TelemetryStopwatch.startKeyed(histogramId, browserId);
-    };
-    let stopTelemetryStopwatch = resourceType => {
-      let histogramId = `FX_STARTUP_MIGRATION_UNDO_${resourceType.toUpperCase()}_MS`;
-      TelemetryStopwatch.finishKeyed(histogramId, browserId);
-    };
-    startTelemetryStopwatch("bookmarks");
-    yield this._removeUnchangedBookmarks(stateData.get("bookmarks")).catch(ex => {
-      Cu.reportError("Uncaught exception when removing unchanged bookmarks!");
-      Cu.reportError(ex);
-    });
-    stopTelemetryStopwatch("bookmarks");
-    reportErrorTelemetry("bookmarks");
-    histogram.add(15);
-
-    startTelemetryStopwatch("visits");
-    yield this._removeSomeVisits(stateData.get("visits")).catch(ex => {
-      Cu.reportError("Uncaught exception when removing history visits!");
-      Cu.reportError(ex);
-    });
-    stopTelemetryStopwatch("visits");
-    reportErrorTelemetry("visits");
-    histogram.add(20);
-
-    startTelemetryStopwatch("logins");
-    yield this._removeUnchangedLogins(stateData.get("logins")).catch(ex => {
-      Cu.reportError("Uncaught exception when removing unchanged logins!");
-      Cu.reportError(ex);
-    });
-    stopTelemetryStopwatch("logins");
-    reportErrorTelemetry("logins");
-    histogram.add(25);
-
-    // This is async, but no need to wait for it.
-    NewTabUtils.links.populateCache(() => {
-      NewTabUtils.allPages.update();
-    }, true);
-
-    this._purgeUndoState(this.UNDO_REMOVED_REASON_UNDO_USED);
-    histogram.add(30);
-    TelemetryStopwatch.finishKeyed("FX_STARTUP_MIGRATION_UNDO_TOTAL_MS", browserId);
-  }),
-
-  _removeNotificationBars() {
-    let browserWindows = Services.wm.getEnumerator("navigator:browser");
-    while (browserWindows.hasMoreElements()) {
-      let win = browserWindows.getNext();
-      if (!win.closed) {
-        for (let browser of win.gBrowser.browsers) {
-          let nb = win.gBrowser.getNotificationBox(browser);
-          let notification = nb.getNotificationWithValue(kNotificationId);
-          if (notification) {
-            nb.removeNotification(notification);
-          }
-        }
-      }
-    }
-  },
-
-  _purgeUndoState(reason) {
-    // We don't wait for the off-main-thread removal to complete. OS.File will
-    // ensure it happens before shutdown.
-    OS.File.remove(kUndoStateFullPath, {ignoreAbsent: true}).then(() => {
-      this._pendingUndoTasks = false;
-    });
-
-    let migrationBrowser = Preferences.get(kAutoMigrateBrowserPref, "unknown");
-    Services.prefs.clearUserPref(kAutoMigrateBrowserPref);
-
-    let histogram =
-      Services.telemetry.getKeyedHistogramById("FX_STARTUP_MIGRATION_UNDO_REASON");
-    histogram.add(migrationBrowser, reason);
-  },
-
-  getBrowserUsedForMigration() {
-    let browserId = Services.prefs.getCharPref(kAutoMigrateBrowserPref);
-    if (browserId) {
-      return MigrationUtils.getBrowserName(browserId);
-    }
-    return null;
-  },
-
-  /**
-   * Show the user a notification bar indicating we automatically imported
-   * their data and offering them the possibility of removing it.
-   * @param target (xul:browser)
-   *        The browser in which we should show the notification.
-   */
-  maybeShowUndoNotification: Task.async(function* (target) {
-    if (!(yield this.canUndo())) {
-      return;
-    }
-
-    // The tab might have navigated since we requested the undo state:
-    let canUndoFromThisPage = ["about:home", "about:newtab"].includes(target.currentURI.spec);
-    if (!canUndoFromThisPage ||
-        !Preferences.get(kUndoUIEnabledPref, false)) {
-      return;
-    }
-
-    let win = target.ownerGlobal;
-    let notificationBox = win.gBrowser.getNotificationBox(target);
-    if (!notificationBox || notificationBox.getNotificationWithValue(kNotificationId)) {
-      return;
-    }
-
-    // At this stage we're committed to show the prompt - unless we shouldn't,
-    // in which case we remove the undo prefs (which will cause canUndo() to
-    // return false from now on.):
-    if (!this.shouldStillShowUndoPrompt()) {
-      this._purgeUndoState(this.UNDO_REMOVED_REASON_OFFER_EXPIRED);
-      this._removeNotificationBars();
-      return;
-    }
-
-    let browserName = this.getBrowserUsedForMigration();
-    if (!browserName) {
-      browserName = gHardcodedStringBundle.GetStringFromName("automigration.undo.unknownbrowser");
-    }
-    const kMessageId = "automigration.undo.message." +
-                      Preferences.get(kAutoMigrateImportedItemIds, "all");
-    const kBrandShortName = gBrandBundle.GetStringFromName("brandShortName");
-    let message = gHardcodedStringBundle.formatStringFromName(kMessageId,
-                                                              [browserName, kBrandShortName], 2);
-
-    let buttons = [
-      {
-        label: gHardcodedStringBundle.GetStringFromName("automigration.undo.keep2.label"),
-        accessKey: gHardcodedStringBundle.GetStringFromName("automigration.undo.keep2.accesskey"),
-        callback: () => {
-          this._purgeUndoState(this.UNDO_REMOVED_REASON_OFFER_REJECTED);
-          this._removeNotificationBars();
-        },
-      },
-      {
-        label: gHardcodedStringBundle.GetStringFromName("automigration.undo.dontkeep2.label"),
-        accessKey: gHardcodedStringBundle.GetStringFromName("automigration.undo.dontkeep2.accesskey"),
-        callback: () => {
-          this._maybeOpenUndoSurveyTab(win);
-          this.undo();
-        },
-      },
-    ];
-    notificationBox.appendNotification(
-      message, kNotificationId, null, notificationBox.PRIORITY_INFO_HIGH, buttons
-    );
-    let remainingDays = Preferences.get(kAutoMigrateDaysToOfferUndoPref, 0);
-    Services.telemetry.getHistogramById("FX_STARTUP_MIGRATION_UNDO_OFFERED").add(4 - remainingDays);
-  }),
-
-  shouldStillShowUndoPrompt() {
-    let today = new Date();
-    // Round down to midnight:
-    today = new Date(today.getFullYear(), today.getMonth(), today.getDate());
-    // We store the unix timestamp corresponding to midnight on the last day
-    // on which we prompted. Fetch that and compare it to today's date.
-    // (NB: stored as a string because int prefs are too small for unix
-    // timestamps.)
-    let previousPromptDateMsStr = Preferences.get(kAutoMigrateLastUndoPromptDateMsPref, "0");
-    let previousPromptDate = new Date(parseInt(previousPromptDateMsStr, 10));
-    if (previousPromptDate < today) {
-      let remainingDays = Preferences.get(kAutoMigrateDaysToOfferUndoPref, 4) - 1;
-      Preferences.set(kAutoMigrateDaysToOfferUndoPref, remainingDays);
-      Preferences.set(kAutoMigrateLastUndoPromptDateMsPref, today.valueOf().toString());
-      if (remainingDays <= 0) {
-        return false;
-      }
-    }
-    return true;
-  },
-
-  UNDO_REMOVED_REASON_UNDO_USED: 0,
-  UNDO_REMOVED_REASON_SYNC_SIGNIN: 1,
-  UNDO_REMOVED_REASON_PASSWORD_CHANGE: 2,
-  UNDO_REMOVED_REASON_BOOKMARK_CHANGE: 3,
-  UNDO_REMOVED_REASON_OFFER_EXPIRED: 4,
-  UNDO_REMOVED_REASON_OFFER_REJECTED: 5,
-
-  _jsonifyUndoState(state) {
-    if (!state) {
-      return "null";
-    }
-    // Deal with date serialization.
-    let bookmarks = state.get("bookmarks");
-    for (let bm of bookmarks) {
-      bm.lastModified = bm.lastModified.getTime();
-    }
-    let serializableState = {
-      bookmarks,
-      logins: state.get("logins"),
-      visits: state.get("visits"),
-    };
-    return JSON.stringify(serializableState);
-  },
-
-  _dejsonifyUndoState(state) {
-    state = JSON.parse(state);
-    if (!state) {
-      return new Map();
-    }
-    for (let bm of state.bookmarks) {
-      bm.lastModified = new Date(bm.lastModified);
-    }
-    return new Map([
-      ["bookmarks", state.bookmarks],
-      ["logins", state.logins],
-      ["visits", state.visits],
-    ]);
-  },
-
-  /**
-   * Store the items we've saved into a pref. We use this to be able to show
-   * a detailed message to the user indicating what we've imported.
-   * @param state (Map)
-   *        The 'undo' state for the import, which contains info about
-   *        how many items of each kind we've (tried to) import.
-   */
-  _setImportedItemPrefFromState(state) {
-    let itemsWithData = [];
-    if (state) {
-      for (let itemType of state.keys()) {
-        if (state.get(itemType).length) {
-          itemsWithData.push(itemType);
-        }
-      }
-    }
-    if (itemsWithData.length == 3) {
-      itemsWithData = "all";
-    } else {
-      itemsWithData = itemsWithData.sort().join(".");
-    }
-    if (itemsWithData) {
-      Preferences.set(kAutoMigrateImportedItemIds, itemsWithData);
-    }
-  },
-
-  /**
-   * Used for the shutdown blocker's information field.
-   */
-  _saveUndoStateTrackerForShutdown: "not running",
-  /**
-   * Store the information required for using 'undo' of the automatic
-   * migration in the user's profile.
-   */
-  saveUndoState: Task.async(function* () {
-    let resolveSavingPromise;
-    this._saveUndoStateTrackerForShutdown = "processing undo history";
-    this._savingPromise = new Promise(resolve => { resolveSavingPromise = resolve });
-    let state = yield MigrationUtils.stopAndRetrieveUndoData();
-
-    if (!state || ![...state.values()].some(ary => ary.length > 0)) {
-      // If we didn't import anything, abort now.
-      resolveSavingPromise();
-      return Promise.resolve();
-    }
-
-    this._saveUndoStateTrackerForShutdown = "saving imported item list";
-    this._setImportedItemPrefFromState(state);
-
-    this._saveUndoStateTrackerForShutdown = "writing undo history";
-    this._undoSavePromise = OS.File.writeAtomic(
-      kUndoStateFullPath, this._jsonifyUndoState(state), {
-        encoding: "utf-8",
-        compression: "lz4",
-        tmpPath: kUndoStateFullPath + ".tmp",
-      });
-    this._undoSavePromise.then(
-      rv => {
-        resolveSavingPromise(rv);
-        delete this._savingPromise;
-      },
-      e => {
-        Cu.reportError("Could not write undo state for automatic migration.");
-        throw e;
-      });
-    return this._undoSavePromise;
-  }),
-
-  _removeUnchangedBookmarks: Task.async(function* (bookmarks) {
-    if (!bookmarks.length) {
-      return;
-    }
-
-    let guidToLMMap = new Map(bookmarks.map(b => [b.guid, b.lastModified]));
-    let bookmarksFromDB = [];
-    let bmPromises = Array.from(guidToLMMap.keys()).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.
-      try {
-        return PlacesUtils.bookmarks.fetch(guid).then(bm => bm && bookmarksFromDB.push(bm), () => {});
-      } catch (ex) {
-        // Ignore immediate exceptions, too.
-      }
-      return Promise.resolve();
-    });
-    // We can't use the result of Promise.all because that would include nulls
-    // for bookmarks that no longer exist (which we're catching above).
-    yield Promise.all(bmPromises);
-    let unchangedBookmarks = bookmarksFromDB.filter(bm => {
-      return bm.lastModified.getTime() == guidToLMMap.get(bm.guid).getTime();
-    });
-
-    // We need to remove items without children first, followed by their
-    // parents, etc. In order to do this, find out how many ancestors each item
-    // has that also appear in our list of things to remove, and sort the items
-    // by those numbers. This ensures that children are always removed before
-    // their parents.
-    function determineAncestorCount(bm) {
-      if (bm._ancestorCount) {
-        return bm._ancestorCount;
-      }
-      let myCount = 0;
-      let parentBM = unchangedBookmarks.find(item => item.guid == bm.parentGuid);
-      if (parentBM) {
-        myCount = determineAncestorCount(parentBM) + 1;
-      }
-      bm._ancestorCount = myCount;
-      return myCount;
-    }
-    unchangedBookmarks.forEach(determineAncestorCount);
-    unchangedBookmarks.sort((a, b) => b._ancestorCount - a._ancestorCount);
-    for (let {guid} of unchangedBookmarks) {
-      // Can't just use a .catch() because Bookmarks.remove() can throw (rather
-      // than returning rejected promises).
-      try {
-        yield PlacesUtils.bookmarks.remove(guid, {preventRemovalOfNonEmptyFolders: true});
-      } catch (err) {
-        if (err && err.message != "Cannot remove a non-empty folder.") {
-          this._errorMap.bookmarks++;
-          Cu.reportError(err);
-        }
-      }
-    }
-  }),
-
-  _removeUnchangedLogins: Task.async(function* (logins) {
-    for (let login of logins) {
-      let foundLogins = LoginHelper.searchLoginsWithObject({guid: login.guid});
-      if (foundLogins.length) {
-        let foundLogin = foundLogins[0];
-        foundLogin.QueryInterface(Ci.nsILoginMetaInfo);
-        if (foundLogin.timePasswordChanged == login.timePasswordChanged) {
-          try {
-            Services.logins.removeLogin(foundLogin);
-          } catch (ex) {
-            Cu.reportError("Failed to remove a login for " + foundLogins.hostname);
-            Cu.reportError(ex);
-            this._errorMap.logins++;
-          }
-        }
-      }
-    }
-  }),
-
-  _removeSomeVisits: Task.async(function* (visits) {
-    for (let urlVisits of visits) {
-      let urlObj;
-      try {
-        urlObj = new URL(urlVisits.url);
-      } catch (ex) {
-        continue;
-      }
-      let visitData = {
-        url: urlObj,
-        beginDate: PlacesUtils.toDate(urlVisits.first),
-        endDate: PlacesUtils.toDate(urlVisits.last),
-        limit: urlVisits.visitCount,
-      };
-      try {
-        yield PlacesUtils.history.removeVisitsByFilter(visitData);
-      } catch (ex) {
-        this._errorMap.visits++;
-        try {
-          visitData.url = visitData.url.href;
-        } catch (ignoredEx) {}
-        Cu.reportError("Failed to remove a visit: " + JSON.stringify(visitData));
-        Cu.reportError(ex);
-      }
-    }
-  }),
-
-  /**
-   * Maybe open a new tab with a survey. The tab will only be opened if all of
-   * the following are true:
-   * - the 'browser.migrate.automigrate.undo-survey' pref is not empty.
-   *   It should contain the URL of the survey to open.
-   * - the 'browser.migrate.automigrate.undo-survey-locales' pref, a
-   *   comma-separated list of language codes, contains the language code
-   *   that is currently in use for the 'global' chrome pacakge (ie the
-   *   locale in which the user is currently using Firefox).
-   *   The URL will be passed through nsIURLFormatter to allow including
-   *   build ids etc. The special additional formatting variable
-   *   "%IMPORTEDBROWSER" is also replaced with the name of the browser
-   *   from which we imported data.
-   *
-   * @param {Window} chromeWindow   A reference to the window in which to open a link.
-   */
-  _maybeOpenUndoSurveyTab(chromeWindow) {
-    let canDoSurveyInLocale = false;
-    try {
-      let surveyLocales = Preferences.get(kAutoMigrateUndoSurveyLocalePref, "");
-      surveyLocales = surveyLocales.split(",").map(str => str.trim());
-      // Strip out any empty elements, so an empty pref doesn't
-      // lead to a an array with 1 empty string in it.
-      surveyLocales = new Set(surveyLocales.filter(str => !!str));
-      let chromeRegistry = Cc["@mozilla.org/chrome/chrome-registry;1"]
-                             .getService(Ci.nsIXULChromeRegistry);
-      canDoSurveyInLocale =
-        surveyLocales.has(chromeRegistry.getSelectedLocale("global"));
-    } catch (ex) {
-      /* ignore exceptions and just don't do the survey. */
-    }
-
-    let migrationBrowser = this.getBrowserUsedForMigration();
-    let rawURL = Preferences.get(kAutoMigrateUndoSurveyPref, "");
-    if (!canDoSurveyInLocale || !migrationBrowser || !rawURL) {
-      return;
-    }
-
-    let url = Services.urlFormatter.formatURL(rawURL);
-    url = url.replace("%IMPORTEDBROWSER%", encodeURIComponent(migrationBrowser));
-    chromeWindow.openUILinkIn(url, "tab");
-  },
-
-  QueryInterface: XPCOMUtils.generateQI(
-    [Ci.nsIObserver, Ci.nsINavBookmarkObserver, Ci.nsISupportsWeakReference]
-  ),
-};
-
-AutoMigrate.init();