Fix JavaScript errors in options2

chrome/browser/resources/options2/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.
 
 var AddLanguageOverlay = options.AddLanguageOverlay;
 var AdvancedOptions = options.AdvancedOptions;
 var AlertOverlay = options.AlertOverlay;
 var AutofillEditAddressOverlay = options.AutofillEditAddressOverlay;
 var AutofillEditCreditCardOverlay = options.AutofillEditCreditCardOverlay;
 var AutofillOptions = options.AutofillOptions;
@@ skipping 214 matching lines @@
     // Proxy page is now per network and only reachable from internet details.
     if (pageName != 'proxy') {
       // Show page, but don't update history (there's already an entry for it).
       OptionsPage.showPageByName(pageName, false);
     }
   } else {
     OptionsPage.showDefaultPage();
   }
 
   var subpagesNavTabs = document.querySelectorAll('.subpages-nav-tabs');
-  for(var i = 0; i < subpagesNavTabs.length; i++) {
+  for (var i = 0; i < subpagesNavTabs.length; i++) {
     subpagesNavTabs[i].onclick = function(event) {
       OptionsPage.showTab(event.srcElement);
     }
   }
 
   // Allow platform specific CSS rules.
   cr.enablePlatformSpecificCSSRules();
 
   if (navigator.plugins['Shockwave Flash'])
     document.documentElement.setAttribute('hasFlashPlugin', '');
 }
 
 document.addEventListener('DOMContentLoaded', load);
 
+/**
+ * Listener for the |beforeunload| event.
+ */
 window.onbeforeunload = function() {
   options.OptionsPage.willClose();
 };
 
+/**
+ * Listener for the |popstate| event.
+ * @param {Event} e The |popstate| event.
+ */
 window.onpopstate = function(e) {
   options.OptionsPage.setState(e.state);
 };