Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/webstore.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 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(
         preferredStoreLinkUrl, successCallback, failureCallback) {
       var installId = Install(
           preferredStoreLinkUrl, successCallback, failureCallback);
       if (installId !== undefined) {
         pendingInstalls[installId] = {
           successCallback: successCallback,
           failureCallback: failureCallback
@@ skipping 14 matching lines @@
       if (success && pendingInstall.successCallback) {
         pendingInstall.successCallback();
       } else if (!success && pendingInstall.failureCallback) {
         pendingInstall.failureCallback(error);
       }
     } finally {
       delete pendingInstall[installId];
     }
   }
 })();