ServiceWorker: Enable ServiceWorkerRegistration and update layout tests

LayoutTests/http/tests/serviceworker/active.html

Index: LayoutTests/http/tests/serviceworker/active.html
diff --git a/LayoutTests/http/tests/serviceworker/active.html b/LayoutTests/http/tests/serviceworker/active.html
index 68ec45dd5bfcfbaf7b46c181540078f47afd4762..b1bd7930f6fb82f781c1e6ee0d5e909f17b67541 100644
--- a/LayoutTests/http/tests/serviceworker/active.html
+++ b/LayoutTests/http/tests/serviceworker/active.html
@@ -11,6 +11,7 @@ async_test(function(t) {
     var url = 'resources/worker-no-op.js';
     var scope = 'resources/blank.html';
     var frame;
+    var registration;
 
     navigator.serviceWorker.unregister(scope)
       .then(step(function() { return with_iframe(scope); }))
@@ -18,6 +19,10 @@ async_test(function(t) {
           frame = f;
           return navigator.serviceWorker.register(url, {scope: scope});
         }))
+      .then(step(function(r) {
+          registration = r;
+          return wait_for_update(t, registration);
+        }))
       .then(step(function(serviceWorker) {
           return wait_for_state(t, serviceWorker, 'activating');
         }))
@@ -28,15 +33,15 @@ async_test(function(t) {
             null,
             'On activating state a document should not have a controller');
           assert_equals(
-            container.active.scriptURL,
+            registration.active.scriptURL,
             normalizeURL(url),
             'On activating state a document should have an active worker ');
           assert_equals(
-            container.waiting,
+            registration.waiting,
             null,
             'On activating state a document should not have a waiting worker');
           assert_equals(
-            container.installing,
+            registration.installing,
             null,
             'On activating state a document should not have an installing ' +
                 'worker');