Replace deprecated webkitCreateShadowRoot with createShadowRoot.

chrome/renderer/resources/extensions/window_controls.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.
 
 //
 // <window-controls> shadow element implementation.
 //
 
 var chrome = requireNative('chrome').GetChrome();
 var forEach = require('utils').forEach;
@@ skipping 22 matching lines @@
 WindowControls.prototype.createShadowRoot_ = function(node) {
   // Initialize |template| from HTML template resource and cache result.
   var template = WindowControls.prototype.template_element;
   if (!template) {
     var element = document.createElement('div');
     element.innerHTML = getHtmlTemplate();
     WindowControls.prototype.template_element = element.firstChild;
     template = WindowControls.prototype.template_element;
   }
   // Create shadow root element with template clone as first child.
-  var shadowRoot = node.webkitCreateShadowRoot();
+  var shadowRoot = node.createShadowRoot();
   shadowRoot.appendChild(template.content.cloneNode(true));
   return shadowRoot;
 }
 
 /**
  * @private
  */
 WindowControls.prototype.setupWindowControls_ = function() {
   var self = this;
   this.shadowRoot_.querySelector("#close-control").addEventListener('click',
@@ skipping 15 matching lines @@
   if (chrome.app.window.current().isMaximized()) {
     chrome.app.window.current().restore();
   } else {
     chrome.app.window.current().maximize();
   }
 }
 
 addTagWatcher('WINDOW-CONTROLS', function(addedNode) {
   new WindowControls(addedNode);
 });