Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/event.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.
 
-var chrome = chrome || {};
-(function () {
-  native function GetChromeHidden();
-  native function AttachEvent(eventName);
-  native function DetachEvent(eventName, manual);
-  native function Print();
+  var eventBindingsNatives = requireNative('event_bindings');
+  var AttachEvent = eventBindingsNatives.AttachEvent;
+  var DetachEvent = eventBindingsNatives.DetachEvent;
+  var Print = eventBindingsNatives.Print;
 
-  var chromeHidden = GetChromeHidden();
+  var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 
   // Local implementation of JSON.parse & JSON.stringify that protect us
   // from being clobbered by an extension.
   //
   // TODO(aa): This makes me so sad. We shouldn't need it, as we can just pass
   // Values directly over IPC without serializing to strings and use
   // JSONValueConverter.
   chromeHidden.JSON = new (function() {
     var $Object = Object;
     var $Array = Array;
@@ skipping 281 matching lines @@
     for (var i = 0; i < allAttachedEvents.length; ++i) {
       var event = allAttachedEvents[i];
       if (event)
         event.detach_(false);
     }
   };
 
   chromeHidden.dispatchError = function(msg) {
     console.error(msg);
   };
-})();