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

chrome/test/data/extensions/api_test/webrequest_sendmessage/background.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 EVENT_MESSAGE_EXTENSION_STRING = "Extension";
 
 // Constants as functions, not to be called until after runTests.
 function getURLHttpSimpleLoad() {
-  return getServerURL('files/extensions/api_test/webrequest/simpleLoad/a.html');
+  return getServerURL('extensions/api_test/webrequest/simpleLoad/a.html');
 }
 
 function getServerURL(path) {
   return 'http://www.a.com:' + testServerPort + '/' + path;
 }
 
 function runTests(tests) {
   chrome.test.getConfig(function(config) {
     testServerPort = config.testServer.port;
     chrome.test.runTests(tests);
@@ skipping 45 matching lines @@
               {message: EVENT_MESSAGE_EXTENSION_STRING}),
         ],
       };
       chrome.declarativeWebRequest.onRequest.addRules([rule], function() {
         chrome.tabs.create({"url": getURLHttpSimpleLoad()});
       });
     });
   }
 ]);