Push API: Validate storage before returning cached subscriptions

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';
 
 // The ResultQueue is a mechanism for passing messages back to the test
 // framework.
 var resultQueue = new ResultQueue();
 
@@ skipping 51 matching lines @@
 function replaceServiceWorker() {
   navigator.serviceWorker.register('service_worker_with_skipWaiting_claim.js', {
     scope: './'
   }).then(swRegistrationReady).then(() => {
     sendResultToTest('ok - service worker replaced');
   }).catch(sendErrorToTest);
 }
 
 function removeManifest() {
   var element = document.querySelector('link[rel="manifest"]');
-  if (element) {
+  if (element)
     element.parentNode.removeChild(element);
-    sendResultToTest('manifest removed');
-  } else {
-    sendResultToTest('unable to find manifest element');
-  }
+  sendResultToTest('manifest removed');
 }
 
 function swapManifestNoSenderId() {
   var element = document.querySelector('link[rel="manifest"]');
   if (element) {
     element.href = 'manifest_no_sender_id.json';
     sendResultToTest('sender id removed from manifest');
   } else {
     sendResultToTest('unable to find manifest element');
   }
@@ skipping 136 matching lines @@
   }).catch(sendErrorToTest);
 }
 
 navigator.serviceWorker.addEventListener('message', function(event) {
   var message = JSON.parse(event.data);
   if (message.type == 'push')
     resultQueue.push(message.data);
   else
     sendResultToTest(message.data);
 }, false);