Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/app.js

Index: chrome/renderer/resources/extensions/app.js
diff --git a/chrome/renderer/resources/extensions/app.js b/chrome/renderer/resources/extensions/app.js
index 8fbce65bcddb8ad35ee79d8ee06ed6c23cee34f2..f868ed5d2913feca3eae2c714636a3f434f51b69 100644
--- a/chrome/renderer/resources/extensions/app.js
+++ b/chrome/renderer/resources/extensions/app.js
@@ -2,14 +2,12 @@
 // 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 GetIsInstalled();
-  native function Install();
-  native function GetDetails();
-  native function GetDetailsForFrame();
-  native function GetAppNotifyChannel();
+  var GetChromeHidden = natives.GetChromeHidden;
+  var GetIsInstalled = natives.GetIsInstalled;
+  var Install = natives.Install;
+  var GetDetails = natives.GetDetails;
+  var GetDetailsForFrame = natives.GetDetailsForFrame;
+  var GetAppNotifyChannel = natives.GetAppNotifyChannel;
 
   var chromeHidden = GetChromeHidden();
   var callbacks = {};
@@ -41,4 +39,3 @@ var chrome = chrome || {};
       delete callbacks[callbackId];
     }
   };
-})();