Enable keyboard shortcuts for chrome://extensions

chrome/browser/resources/extensions/extensions.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.
 
+<include src="../../../../ui/webui/resources/js/cr/ui/focus_row.js">
+<include src="../../../../ui/webui/resources/js/cr/ui/focus_grid.js">
 <include src="../uber/uber_utils.js">
 <include src="extension_code.js">
 <include src="extension_commands_overlay.js">
 <include src="extension_error_overlay.js">
 <include src="extension_focus_manager.js">
 <include src="extension_list.js">
 <include src="pack_extension_overlay.js">
 <include src="extension_loader.js">
 <include src="extension_options_overlay.js">
 
@@ skipping 117 matching lines @@
       uber.setTitle(loadTimeData.getString('extensionSettings'));
 
       // This will request the data to show on the page and will get a response
       // back in returnExtensionsData.
       chrome.send('extensionSettingsRequestExtensionsData');
 
       var extensionLoader = extensions.ExtensionLoader.getInstance();
 
       $('toggle-dev-on').addEventListener('change', function(e) {
         this.updateDevControlsVisibility_(true);
+        $('extension-settings-list').updateFocusableElements();
         chrome.send('extensionSettingsToggleDeveloperMode',
                     [$('toggle-dev-on').checked]);
       }.bind(this));
 
       window.addEventListener('resize', function() {
         this.updateDevControlsVisibility_(false);
       }.bind(this));
 
       // Set up the three dev mode buttons (load unpacked, pack and update).
       $('load-unpacked').addEventListener('click', function(e) {
@@ skipping 307 matching lines @@
 
   // Export
   return {
     ExtensionSettings: ExtensionSettings
   };
 });
 
 window.addEventListener('load', function(e) {
   extensions.ExtensionSettings.getInstance().initialize();
 });