Address the TODOs in the PushMessagingBrowserTest for the endpoint merge.

chrome/test/data/push_messaging/push_test.js

 // Copyright 2014 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.
 
 'use strict';
 
 var resultQueue = new ResultQueue();
 var pushSubscription = null;
 
 // Sends data back to the test. This must be in response to an earlier
@@ skipping 79 matching lines @@
   } else {
     sendResultToTest('unable to find manifest element');
   }
 }
 
 function subscribePush() {
   navigator.serviceWorker.ready.then(function(swRegistration) {
     return swRegistration.pushManager.subscribe()
         .then(function(subscription) {
           pushSubscription = subscription;
-          sendResultToTest(
-              subscription.endpoint + ' - ' + subscription.subscriptionId);
+          sendResultToTest(subscription.endpoint);
         });
   }).catch(sendErrorToTest);
 }
 
 function permissionState() {
   navigator.serviceWorker.ready.then(function(swRegistration) {
     return swRegistration.pushManager.permissionState()
         .then(function(permission) {
           sendResultToTest('permission status - ' + permission);
         });
@@ skipping 28 matching lines @@
     sendResultToTest(subscription ? 'true - subscribed'
                                   : 'false - not subscribed');
   }).catch(sendErrorToTest);
 }
 
 addEventListener('message', function(event) {
   var message = JSON.parse(event.data);
   if (message.type == 'push')
     resultQueue.push(message.data);
 }, false);