Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/webstore.js

Index: chrome/renderer/resources/extensions/webstore.js
diff --git a/chrome/renderer/resources/extensions/webstore.js b/chrome/renderer/resources/extensions/webstore.js
index b387c46f26d9297d903f90384f110ac6f40d2f00..14bacc531eb5aeb580c50ed9bda1275fdfcb5cac 100644
--- a/chrome/renderer/resources/extensions/webstore.js
+++ b/chrome/renderer/resources/extensions/webstore.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 Install(preferredStoreUrl, onSuccess, onFailure);
+  var webstoreNatives = requireNative('webstore');
+  var Install = webstoreNatives.Install;
 
-  var chromeHidden = GetChromeHidden();
+  var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
   var pendingInstalls = {};
   chrome.webstore = new function() {
     this.install = function(
@@ -41,4 +39,3 @@ var chrome = chrome || {};
       delete pendingInstall[installId];
     }
   }
-})();