GTTF: convert some tests in chrome to use EmbeddedTestServer patch nr 1

chrome/test/data/extensions/api_test/content_scripts/extension_iframe/test.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.
 
 chrome.test.runTests([
   // Tests receiving a request from a content script and responding.
   function onRequest() {
     chrome.extension.onRequest.addListener(
       function(request, sender, sendResponse) {
         chrome.test.assertTrue(request.success);
         chrome.test.succeed();
       }
     );
   }
 ]);
 
 chrome.test.getConfig(function(config) {
   chrome.test.log("Creating tab...");
 
-  var test_url = "http://localhost:PORT/files/extensions/test_file.html"
+  var test_url = "http://localhost:PORT/extensions/test_file.html"
       .replace(/PORT/, config.testServer.port);
 
   chrome.tabs.create({ url: test_url });
 });