Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/windows_custom_bindings.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.
 
 // Custom bindings for the windows API.
 
-(function() {
-
-native function GetChromeHidden();
+var GetChromeHidden = natives.GetChromeHidden;
 
 GetChromeHidden().registerCustomHook('windows', function(api) {
   var apiFunctions = api.apiFunctions;
 
   apiFunctions.setUpdateArgumentsPreValidate("windows.get", function() {
     // Old signature:
     //    get(int windowId, function callback);
     // New signature:
     //    get(int windowId, object populate, function callback);
     if (arguments.length == 2 && typeof(arguments[1]) == "function") {
@@ skipping 42 matching lines @@
     //    getAll(object populate, function callback);
     if (arguments.length == 1 && typeof(arguments[0]) == "function") {
       // If the old signature is used, add a null populate object.
       newArgs = [null, arguments[0]];
     } else {
       newArgs = arguments;
     }
     return newArgs;
   });
 });
-
-})();