webui: remove FocusManager.disableMouseFocusOnButtons().

chrome/browser/resources/help/help.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="../uber/uber_page_manager_observer.js">
 <include src="../uber/uber_utils.js">
 
 (function() {
   var HelpPage = help.HelpPage;
   var PageManager = cr.ui.pageManager.PageManager;
 
   /**
    * DOMContentLoaded handler, sets up the page.
    */
   function load() {
     PageManager.register(HelpPage.getInstance());
 
     if (help.ChannelChangePage) {
       PageManager.registerOverlay(help.ChannelChangePage.getInstance(),
                                   HelpPage.getInstance());
     }
-    cr.ui.FocusManager.disableMouseFocusOnButtons();
     PageManager.addObserver(new uber.PageManagerObserver());
     PageManager.initialize(HelpPage.getInstance());
     uber.onContentFrameLoaded();
 
     var pageName = PageManager.getPageNameFromPath();
     // Still update history so that chrome://help/nonexistant redirects
     // appropriately to chrome://help/. If the URL matches, updateHistory
     // will avoid adding the extra state.
     var updateHistory = true;
     PageManager.showPageByName(pageName, updateHistory, {replaceState: true});
@@ skipping 10 matching lines @@
 
   /**
    * Listener for the |popstate| event.
    * @param {Event} e The |popstate| event.
    */
   window.onpopstate = function(e) {
     var pageName = PageManager.getPageNameFromPath();
     PageManager.setState(pageName, location.hash, e.state);
   };
 })();