Add test without skipWaiting() to demonstrate extension & service worker update.

chrome/test/data/extensions/api_test/service_worker/update_without_skip_waiting/v1/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 serviceWorkerPromise = new Promise(function(resolve, reject) {
   navigator.serviceWorker.register('sw.js').then(function() {
     return navigator.serviceWorker.ready;
   }).then(function(registration) {
     var sw = registration.active;
     var channel = new MessageChannel();
     channel.port1.onmessage = function(e) {
       if (e.data == 'Pong from version 1') {
         resolve(e.data);
       } else {
         reject(e.data);  // Fail fast.
       }
     };
     sw.postMessage('ping', [channel.port2]);
   }).catch(function(err) {
     reject(err);
   });
 });
 
 serviceWorkerPromise.then(function(message) {
   chrome.test.sendMessage(message);
 }).catch(function(err) {
-  chrome.test.sendMessage('FAILURE_V1');
+  chrome.test.sendMessage('FAILURE');
 });