Update WebUI calls to use extensions namespace, update IDs in c/b/r/extensions

chrome/browser/ui/webui/extensions/extension_settings_browsertest.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.
 
 // TODO(dbeam): test for loading upacked extensions?
 
 /**
  * TestFixture for extension settings WebUI testing.
  * @extends {testing.Test}
  * @constructor
  */
 function ExtensionSettingsWebUITest() {}
 
 ExtensionSettingsWebUITest.prototype = {
   __proto__: testing.Test.prototype,
 
   /**
    * A URL to load before starting each test.
    * @type {string}
    * @const
    */
   browsePreload: 'chrome://extensions-frame/',
 };
 
 TEST_F('ExtensionSettingsWebUITest', 'testChromeSendHandled', function() {
   assertEquals(this.browsePreload, document.location.href);
 
   // This dialog should be hidden at first.
-  assertFalse($('packExtensionOverlay').classList.contains('showing'));
+  assertFalse($('pack-extension-overlay').classList.contains('showing'));
 
   // Show the dialog, which triggers a chrome.send() for metrics purposes.
   cr.dispatchSimpleEvent($('pack-extension'), 'click');
-  assertTrue($('packExtensionOverlay').classList.contains('showing'));
+  assertTrue($('pack-extension-overlay').classList.contains('showing'));
 });
 
 /**
  * TestFixture for extension settings WebUI testing (commands config edition).
  * @extends {testing.Test}
  * @constructor
  */
 function ExtensionSettingsCommandsConfigWebUITest() {}
 
 ExtensionSettingsCommandsConfigWebUITest.prototype = {
   __proto__: testing.Test.prototype,
 
   /**
    * A URL to load before starting each test.
    * @type {string}
    * @const
    */
   browsePreload: 'chrome://extensions-frame/configureCommands',
 };
 
 TEST_F('ExtensionSettingsCommandsConfigWebUITest', 'testChromeSendHandler',
     function() {
   // Just navigating to the page should trigger the chrome.send().
   assertEquals(this.browsePreload, document.location.href);
-  assertTrue($('extensionCommandsOverlay').classList.contains('showing'));
+  assertTrue($('extension-commands-overlay').classList.contains('showing'));
 });