Revert 125801 - Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/i18n_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 i18n API.
 
-var i18nNatives = requireNative('i18n');
-var GetL10nMessage = i18nNatives.GetL10nMessage;
+(function() {
 
-var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
+native function GetChromeHidden();
+native function GetL10nMessage();
 
-chromeHidden.registerCustomHook('i18n',
+GetChromeHidden().registerCustomHook('i18n',
                                      function(bindingsAPI, extensionId) {
   var apiFunctions = bindingsAPI.apiFunctions;
 
   apiFunctions.setHandleRequest('getMessage',
                                 function(messageName, substitutions) {
     return GetL10nMessage(messageName, substitutions, extensionId);
   });
 });
+
+})();