Replace deprecated webkitCreateShadowRoot with createShadowRoot.

chrome/renderer/resources/extensions/web_view.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.
 
 // This module implements Webview (<webview>) as a custom element that wraps a
 // BrowserPlugin object element. The object element is hidden within
 // the shadow DOM of the Webview element.
 
 var DocumentNatives = requireNative('document_natives');
 var EventBindings = require('event_bindings');
@@ skipping 148 matching lines @@
 // Implemented when the experimental API is available.
 WebViewInternal.maybeRegisterExperimentalAPIs = function(proto) {}
 
 /**
  * @constructor
  */
 function WebViewInternal(webviewNode) {
   privates(webviewNode).internal = this;
   this.webviewNode = webviewNode;
   this.browserPluginNode = this.createBrowserPluginNode();
-  var shadowRoot = this.webviewNode.webkitCreateShadowRoot();
+  var shadowRoot = this.webviewNode.createShadowRoot();
   shadowRoot.appendChild(this.browserPluginNode);
 
   this.setupWebviewNodeAttributes();
   this.setupFocusPropagation();
   this.setupWebviewNodeProperties();
   this.setupWebviewNodeEvents();
 }
 
 /**
  * @private
@@ skipping 981 matching lines @@
 
 /**
  * Implemented when the experimental API is available.
  * @private
  */
 WebViewInternal.prototype.setupExperimentalContextMenus_ = function() {};
 
 exports.WebView = WebView;
 exports.WebViewInternal = WebViewInternal;
 exports.CreateEvent = CreateEvent;