Implement a module system for the extension bindings JS.

chrome/renderer/resources/extensions/apitest.js

 // Copyright (c) 2011 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.
 
 // extension_apitest.js
 // mini-framework for ExtensionApiTest browser tests
 
-var chrome = chrome || {};
 (function() {
   chrome.test = chrome.test || {};
 
   chrome.test.tests = chrome.test.tests || [];
 
   var completed = false;
   var currentTest = null;
   var lastTest = null;
 
   function complete() {
@@ skipping 250 matching lines @@
 
   chrome.test.callbackFail = function(expectedError, func) {
     return chrome.test.callback(func, expectedError);
   };
 
   chrome.test.runTests = function(tests) {
     chrome.test.tests = tests;
     chrome.test.runNextTest();
   };
 })();