DevTools: Implement extension-based status bar buttons

Source/devtools/front_end/main/SimpleApp.js

 // Copyright 2014 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.
 
 /**
  * @constructor
  * @extends {WebInspector.App}
  */
 WebInspector.SimpleApp = function()
 {
     WebInspector.App.call(this);
 };
 
 WebInspector.SimpleApp.prototype = {
-    createGlobalStatusBarItems: function()
-    {
-        this.appendInspectStatusBarItem();
-        this.appendSettingsStatusBarItem();
-    },
-
     createRootView: function()
     {
         var rootView = new WebInspector.RootView();
         WebInspector.inspectorView.show(rootView.element);
         rootView.attachToBody();
     },
 
     __proto__: WebInspector.App.prototype
 };