Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/event.js

Index: chrome/renderer/resources/extensions/event.js
diff --git a/chrome/renderer/resources/extensions/event.js b/chrome/renderer/resources/extensions/event.js
index dffe20193837e78f2e43db42357e14c9d6799a7d..8ddecb79ab49fdd11ffa4163ed0c5796ff4c5eef 100644
--- a/chrome/renderer/resources/extensions/event.js
+++ b/chrome/renderer/resources/extensions/event.js
@@ -2,12 +2,10 @@
 // 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);
-  native function Print();
+  var GetChromeHidden = natives.GetChromeHidden;
+  var AttachEvent = natives.AttachEvent;
+  var DetachEvent = natives.DetachEvent;
+  var Print = natives.Print;
 
   var chromeHidden = GetChromeHidden();
 
@@ -248,4 +246,3 @@ var chrome = chrome || {};
   chromeHidden.dispatchError = function(msg) {
     console.error(msg);
   };
-})();