Replace deprecated webkitCreateShadowRoot with createShadowRoot.

chrome/renderer/resources/extensions/ad_view.js

 // Copyright 2013 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.
 
 // Shim that simulates a <adview> tag via Mutation Observers.
 //
 // The actual tag is implemented via the browser plugin. The internals of this
 // are hidden via Shadow DOM.
 
 // TODO(rpaquay): This file is currently very similar to "web_view.js". Do we
@@ skipping 83 matching lines @@
   });
   return result;
 }
 
 /**
  * @constructor
  */
 function AdView(adviewNode) {
   this.adviewNode_ = adviewNode;
   this.browserPluginNode_ = this.createBrowserPluginNode_();
-  var shadowRoot = this.adviewNode_.webkitCreateShadowRoot();
+  var shadowRoot = this.adviewNode_.createShadowRoot();
   shadowRoot.appendChild(this.browserPluginNode_);
 
   this.setupCustomAttributes_();
   this.setupAdviewNodeObservers_();
   this.setupAdviewNodeMethods_();
   this.setupAdviewNodeProperties_();
   this.setupAdviewNodeEvents_();
   this.setupBrowserPluginNodeObservers_();
 }
 
@@ skipping 271 matching lines @@
   var evt = new Event(eventname, { bubbles: true });
   for(var item in detail) {
       evt[item] = detail[item];
   }
 
   // Dispatch event.
   this.adviewNode_.dispatchEvent(evt);
 }
 
 addTagWatcher('ADVIEW', function(addedNode) { new AdView(addedNode); });