Migrate startup URLs pref.

chrome/browser/resources/options/startup_overlay.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('options', function() {
   /** @const */ var ArrayDataModel = cr.ui.ArrayDataModel;
   /** @const */ var OptionsPage = options.OptionsPage;
   /** @const */ var SettingsDialog = options.SettingsDialog;
 
   /**
@@ skipping 16 matching lines @@
     __proto__: SettingsDialog.prototype,
 
     /**
      * An autocomplete list that can be attached to a text field during editing.
      * @type {HTMLElement}
      * @private
      */
     autocompleteList_: null,
 
     startup_pages_pref_: {
-      'name': 'session.urls_to_restore_on_startup',
+      'name': 'session.startup_urls',
       'disabled': false
     },
 
     /**
      * Initialize the page.
      */
     initializePage: function() {
       SettingsDialog.prototype.initializePage.call(this);
 
       var self = this;
@@ skipping 53 matching lines @@
      * Enables or disables the the custom startup page list controls
      * based on the whether the 'pages to restore on startup' pref is enabled.
      */
     updateControlStates: function() {
       this.setControlsDisabled(
           this.startup_pages_pref_.disabled);
     },
 
     /**
      * Handles change events of the preference
-     * 'session.urls_to_restore_on_startup'.
+     * 'session.startup_urls'.
      * @param {event} preference changed event.
      * @private
      */
     handleStartupPageListChange_: function(event) {
       this.startup_pages_pref_.disabled = event.value.disabled;
       this.updateControlStates();
     },
 
     /**
      * Updates the startup pages list with the given entries.
@@ skipping 44 matching lines @@
       var instance = StartupOverlay.getInstance();
       return instance[name + '_'].apply(instance, arguments);
     };
   });
 
   // Export
   return {
     StartupOverlay: StartupOverlay
   };
 });