Devtools: make DOM traversal utilities climb shadow tree.

Source/devtools/front_end/resources/ResourcesPanel.js

 /*
  * Copyright (C) 2007, 2008, 2010 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 744 matching lines @@
     },
 
     showView: function(view)
     {
         if (view)
             this.showResource(view.resource);
     },
 
     _onmousemove: function(event)
     {
-        var nodeUnderMouse = document.elementFromPoint(event.pageX, event.pageY);
+        var nodeUnderMouse = event.elementFromPoint();
         if (!nodeUnderMouse)
             return;
 
         var listNode = nodeUnderMouse.enclosingNodeOrSelfWithNodeName("li");
         if (!listNode)
             return;
 
         var element = listNode.treeElement;
         if (this._previousHoveredElement === element)
             return;
@@ skipping 1359 matching lines @@
 }
 
 WebInspector.StorageCategoryView.prototype = {
     setText: function(text)
     {
         this._emptyView.text = text;
     },
 
     __proto__: WebInspector.VBox.prototype
 }