[Extension ServiceWorkers] Allow service worker registration

chrome/test/data/extensions/api_test/service_worker/register/page.js

 // Copyright 2015 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 logForDebugging = false;
+var logForDebugging = true;
 function log(message) {
   if (logForDebugging)
     console.log(message);
 }
 
 chrome.test.runTests([
   function registerServiceWorker() {
     navigator.serviceWorker.register('/sw.js').then(function(registration) {
       // Registration was successful
       log('ServiceWorker registration successful with scope: ',
           registration.scope);
-      chrome.test.sendMessage("success");
       chrome.test.succeed();
     }).catch(function(err) {
       // registration failed :(
       var errorMsg = err.name + ': ' + err.message;
       log('ServiceWorker registration failed: ' + errorMsg);
       chrome.test.sendMessage(errorMsg);
       chrome.test.fail();
     });
   }
 ]);