Add ref count to service workers for extension API.

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

Index: chrome/test/data/extensions/api_test/service_worker/api_worker_ref_count/page.js
diff --git a/chrome/test/data/extensions/api_test/service_worker/tabs_create/page.js b/chrome/test/data/extensions/api_test/service_worker/api_worker_ref_count/page.js
similarity index 55%
copy from chrome/test/data/extensions/api_test/service_worker/tabs_create/page.js
copy to chrome/test/data/extensions/api_test/service_worker/api_worker_ref_count/page.js
index 0542b5485544a0c5623b18b44e64b0f1cbdb71ca..3f8ebcc07382c5efbc4d7084d91d66101f70708f 100644
--- a/chrome/test/data/extensions/api_test/service_worker/tabs_create/page.js
+++ b/chrome/test/data/extensions/api_test/service_worker/api_worker_ref_count/page.js
@@ -2,29 +2,21 @@
 // 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) {
+window.runServiceWorker = function() {
   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 == 'chrome.tabs.create callback') {
-        resolve(e.data);
+      if (e.data == 'Worker reply: Hello world') {
+        chrome.test.sendMessage('SUCCESS');
       } else {
-        reject(e.data);
+        chrome.test.sendMessage('FAILURE');
       }
     };
-    sw.postMessage('createTab', [channel.port2]);
-  }).catch(function(err) {
-    reject(err);
-  });
-});
-
-window.runServiceWorker = function() {
-  serviceWorkerPromise.then(function(message) {
-    window.domAutomationController.send(message);
+    sw.postMessage('sendMessageTest', [channel.port2]);
   }).catch(function(err) {
-    window.domAutomationController.send('FAILURE');
+    chrome.test.sendMessage('FAILURE');
   });
 };