NTP4: Remove native focus emulation for bubbles when explictly told to.

chrome/browser/resources/shared/js/cr/ui/bubble.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.
 
 // require: event_tracker.js
 
 cr.define('cr.ui', function() {
 
   // The arrow location specifies how the arrow and bubble are positioned in
   // relation to the anchor node.
@@ skipping 155 matching lines @@
             anchorMid - ARROW_OFFSET_X;
       }
       var top = this.isTop_ ? clientRect.bottom + ARROW_OFFSET_Y :
           clientRect.top - this.clientHeight - ARROW_OFFSET_Y;
 
       this.style.left = left + 'px';
       this.style.top = top + 'px';
     },
 
     /**
-     * Starts showing the bubble. The bubble will grab input and show until the
-     * user clicks away.
+     * Starts showing the bubble. The bubble will show until the user clicks
+     * away or presses Escape.
      */
     show: function() {
       if (!this.hidden)
         return;
 
       document.body.appendChild(this);
       this.hidden = false;
       this.reposition();
       this.showTime_ = Date.now();
 
@@ skipping 14 matching lines @@
       this.parentNode.removeChild(this);
     },
 
     /**
      * Handles keydown and mousedown events, dismissing the bubble if
      * necessary.
      * @param {Event} e The event.
      */
     handleEvent: function(e) {
       switch (e.type) {
-        case 'keydown':
+        case 'keydown': {
           if (e.keyCode == 27)  // Esc
             this.hide();
           break;
-
-        case 'mousedown':
+        }
+        case 'mousedown': {
           if (e.target == this.querySelector('.bubble-close')) {
             this.handleCloseEvent_();
           } else if (!this.contains(e.target)) {
             if (Date.now() - this.showTime_ < this.deactivateToDismissDelay_)
               return;
             this.hide();
           } else {
             return;
           }
           break;
+        }
       }
-
-      e.stopPropagation();
-      e.preventDefault();
-      return;
     },
   };
 
   return {
     ArrowLocation : ArrowLocation,
     Bubble : Bubble,
     BubbleAlignment : BubbleAlignment
   };
 });