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..6abb289084de07e79f5d9c3c5169493dc1395116 100644
--- a/chrome/renderer/resources/extensions/app.js
+++ b/chrome/renderer/resources/extensions/app.js
@@ -2,16 +2,15 @@
 // 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 natives = requireNative('app');
+  var GetIsInstalled = natives.GetIsInstalled;
+  var Install = natives.Install;
+  var GetDetails = natives.GetDetails;
+  var GetDetailsForFrame = natives.GetDetailsForFrame;
+  var GetAppNotifyChannel = natives.GetAppNotifyChannel;
 
-  var chromeHidden = GetChromeHidden();
+  var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
   var callbacks = {};
   var nextCallbackId = 1;