Move apps/shell to extensions/shell.

extensions/shell/renderer/shell_custom_bindings.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.
 
 var shellNatives = requireNative('shell_natives');
 var Binding = require('binding').Binding;
 var forEach = require('utils').forEach;
 var renderViewObserverNatives = requireNative('renderViewObserverNatives');
 
 var currentAppWindow = null;
@@ skipping 58 matching lines @@
   // so the correct JS context is used for global variables such as
   // currentAppWindow.
   apiFunctions.setHandleRequest('initializeAppWindow', function() {
     var AppWindow = function() {};
     AppWindow.prototype.contentWindow = window;
     currentAppWindow = new AppWindow;
   });
 });
 
 exports.binding = shell.generate();