Add new instant extended specific pref.

chrome/browser/resources/options/browser_options.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() {
   var OptionsPage = options.OptionsPage;
   var ArrayDataModel = cr.ui.ArrayDataModel;
   var RepeatingButton = cr.ui.RepeatingButton;
 
   //
@@ skipping 140 matching lines @@
       }
 
       // Search section.
       $('manage-default-search-engines').onclick = function(event) {
         OptionsPage.navigateToPage('searchEngines');
         chrome.send('coreOptionsUserMetricsAction',
                     ['Options_ManageSearchEngines']);
       };
       $('default-search-engine').addEventListener('change',
           this.setDefaultSearchEngine_);
+      if (loadTimeData.getValue('instant_extended')) {
+        // The control must be duplicated because we can't change the pref
+        // attribute here, it would be too late, since the value is initialized
+        // earlier using the original pref name, so we swap the controls.
+        $('instant-enabled-control').hidden = true;
+        $('instant-extended-enabled-control').hidden = false;
+        // For the other elements, we can simply modify them here as follows.
+        $('instant-enabled-indicator').removeAttribute('dialog-pref');
+        $('instant-enabled-control').setAttribute('pref',
+                                                  'instant_extended.enabled');
+        $('instant-enabled-control-label').setAttribute(
+            'for', 'instant-extended-enabled-control');
+      }
 
       // Users section.
       if (loadTimeData.valueExists('profilesInfo')) {
         $('profiles-section').hidden = false;
 
         var profilesList = $('profiles-list');
         options.browser_options.ProfileList.decorate(profilesList);
         profilesList.autoExpands = true;
 
         this.setProfilesInfo_(loadTimeData.getValue('profilesInfo'));
@@ skipping 1191 matching lines @@
     BrowserOptions.getLoggedInUsername = function() {
       return BrowserOptions.getInstance().username_;
     };
   }
 
   // Export
   return {
     BrowserOptions: BrowserOptions
   };
 });