history/settings/extensions/help: focus current frame on mousedown if necessary

ui/webui/resources/js/cr/ui/menu_button.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="../../assert.js">
 
 cr.exportPath('cr.ui');
 
 /**
  * Enum for type of hide. Delayed is used when called by clicking on a
@@ skipping 80 matching lines @@
      * Handles event callbacks.
      * @param {Event} e The event object.
      */
     handleEvent: function(e) {
       if (!this.menu)
         return;
 
       switch (e.type) {
         case 'mousedown':
           if (e.currentTarget == this.ownerDocument) {
-            if (e.target instanceof Element && !this.contains(e.target) &&
+            if (e.target instanceof Node && !this.contains(e.target) &&
                 !this.menu.contains(e.target)) {
               this.hideMenu();
             } else {
               e.preventDefault();
             }
           } else {
             if (this.isMenuShown()) {
               this.hideMenu();
             } else if (e.button == 0) {  // Only show the menu when using left
                                          // mouse button.
@@ skipping 14 matching lines @@
             if (this.menu.handleKeyDown(e)) {
               e.preventDefault();
               e.stopPropagation();
             }
           }
 
           // Show the focus ring on keypress.
           this.classList.remove('using-mouse');
           break;
         case 'focus':
-          if (e.target instanceof Element && !this.contains(e.target) &&
+          if (e.target instanceof Node && !this.contains(e.target) &&
               !this.menu.contains(e.target)) {
             this.hideMenu();
             // Show the focus ring on focus - if it's come from a mouse event,
             // the focus ring will be hidden in the mousedown event handler,
             // executed after this.
             this.classList.remove('using-mouse');
           }
           break;
         case 'activate':
           var hideDelayed = e.target instanceof cr.ui.MenuItem &&
@@ skipping 153 matching lines @@
         'drop-down-arrow-hover', ARROW_WIDTH, ARROW_HEIGHT, opt_hoverColor);
     createDropDownArrowCanvas(
         'drop-down-arrow-active', ARROW_WIDTH, ARROW_HEIGHT, opt_activeColor);
   };
 
   // Export
   return {
     MenuButton: MenuButton,
   };
 });