ServiceWorker: Enable ServiceWorkerRegistration and update layout tests

LayoutTests/http/tests/serviceworker/indexeddb.html

Index: LayoutTests/http/tests/serviceworker/indexeddb.html
diff --git a/LayoutTests/http/tests/serviceworker/indexeddb.html b/LayoutTests/http/tests/serviceworker/indexeddb.html
index 50aacaf9a31aadc38e8ccf1add7be2749faf484e..718f814687775569923dadd03d9e1c43bbfecb00 100644
--- a/LayoutTests/http/tests/serviceworker/indexeddb.html
+++ b/LayoutTests/http/tests/serviceworker/indexeddb.html
@@ -4,32 +4,34 @@
 <script src="../resources/testharnessreport.js"></script>
 <script src="resources/test-helpers.js"></script>
 <script>
-var test = async_test('Verify Indexed DB operation in a Service Worker');
-test.step(function() {
+async_test(function(t) {
     var scope = 'resources/blank.html';
     service_worker_unregister_and_register(
-        test, 'resources/indexeddb-worker.js', scope).then(test.step_func(onRegister));
-
-    function onRegister(worker) {
+      t, 'resources/indexeddb-worker.js', scope)
+    .then(function(registration) {
+        return wait_for_update(t, registration);
+      })
+    .then(function(sw) {
         var messageChannel = new MessageChannel();
-        messageChannel.port1.onmessage = test.step_func(onMessage);
-
-        worker.postMessage({port: messageChannel.port2}, [messageChannel.port2]);
-    }
-
+        messageChannel.port1.onmessage = t.step_func(onMessage);
+        sw.postMessage({port: messageChannel.port2}, [messageChannel.port2]);
+      })
+    .catch(unreached_rejection(t));
+    
     function onMessage() {
-        var openRequest = indexedDB.open('db');
-        openRequest.onsuccess = test.step_func(function() {
-            var db = openRequest.result;
-            var tx = db.transaction('store');
-            var store = tx.objectStore('store');
-            var getRequest = store.get('key');
-            getRequest.onsuccess = test.step_func(function() {
-                assert_equals(getRequest.result, 'value',
-                              'The get() result should match what the worker put().');
-                service_worker_unregister_and_done(test, scope);
+      var openRequest = indexedDB.open('db');
+      openRequest.onsuccess = t.step_func(function() {
+          var db = openRequest.result;
+          var tx = db.transaction('store');
+          var store = tx.objectStore('store');
+          var getRequest = store.get('key');
+          getRequest.onsuccess = t.step_func(function() {
+              assert_equals(
+                getRequest.result, 'value',
+                'The get() result should match what the worker put().');
+              service_worker_unregister_and_done(t, scope);
             });
         });
     }
-});
+  }, 'Verify Indexed DB operation in a Service Worker');
 </script>