Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/schema_generated_bindings.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.
 
 // This script contains privileged chrome extension related javascript APIs.
 // It is loaded by pages whose URL has the chrome-extension protocol.
 
-var chrome = chrome || {};
-(function() {
-  native function GetChromeHidden();
-  native function GetExtensionAPIDefinition();
-  native function GetNextRequestId();
-  native function StartRequest();
-  native function SetIconCommon();
+  require('json_schema');
+  require('event_bindings');
+  var natives = requireNative('schema_generated_bindings');
+  var GetExtensionAPIDefinition = natives.GetExtensionAPIDefinition;
+  var GetNextRequestId = natives.GetNextRequestId;
+  var StartRequest = natives.StartRequest;
+  var SetIconCommon = natives.SetIconCommon;
 
-  var chromeHidden = GetChromeHidden();
+  var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 
   // The object to generate the bindings for "internal" APIs in, so that
   // extensions can't directly call them (without access to chromeHidden),
   // but are still needed for internal mechanisms of extensions (e.g. events).
   //
   // This is distinct to the "*Private" APIs which are controlled via
   // having strict permissions and aren't generated *anywhere* unless needed.
   var internalAPIs = {};
   chromeHidden.internalAPIs = internalAPIs;
 
@@ skipping 719 matching lines @@
     // beginInstallWithManifest2.
     // See http://crbug.com/100242
     if (chrome.webstorePrivate) {
       chrome.webstorePrivate.beginInstallWithManifest2 =
           chrome.webstorePrivate.beginInstallWithManifest3;
     }
 
     if (chrome.test)
       chrome.test.getApiDefinitions = GetExtensionAPIDefinition;
   });
-})();