separate about page into its own page (included in chrome://chrome)

chrome/browser/resources/extensions/extensions.js

 // Copyright (c) 2011 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.
 
 // Used for observing function of the backend datasource for this page by
 // tests.
 var webui_responded_ = false;
 
 var localStrings = new LocalStrings();
 
@@ skipping 162 matching lines @@
 
   // Export
   return {
     ExtensionSettings: ExtensionSettings
   };
 });
 
 var ExtensionSettings = extensions.ExtensionSettings;
 
 window.onload = function() {
-  i18nTemplate.process(document, templateData);
   ExtensionSettings.getInstance().initialize();
-}
+};