ServiceWorker: Enable ServiceWorkerRegistration and update layout tests

LayoutTests/http/tests/serviceworker/unregister.html

Index: LayoutTests/http/tests/serviceworker/unregister.html
diff --git a/LayoutTests/http/tests/serviceworker/unregister.html b/LayoutTests/http/tests/serviceworker/unregister.html
index cadeb871b9330dd61f3673b3afdd1c362ba9d328..077e932fa54b6b28b90e12e8705017f778496292 100644
--- a/LayoutTests/http/tests/serviceworker/unregister.html
+++ b/LayoutTests/http/tests/serviceworker/unregister.html
@@ -13,7 +13,7 @@ async_test(function(t) {
       t.done();
     })
     .catch(unreached_rejection(t));
-}, 'Unregistering out of origin');
+  }, 'Unregistering out of origin');
 
 async_test(function(t) {
   navigator.serviceWorker.unregister('/nothing-here/')
@@ -24,7 +24,7 @@ async_test(function(t) {
       t.done();
     })
     .catch(unreached_rejection(t));
-}, 'Unregistering with no existing registration');
+  }, 'Unregistering with no existing registration');
 
 async_test(function(t) {
   var scope = '/register-then-unregister/';
@@ -39,11 +39,14 @@ async_test(function(t) {
       t.done();
     })
     .catch(unreached_rejection(t));
-}, 'Register then unregister');
+  }, 'Register then unregister');
 
 async_test(function(t) {
   var state_promise;
   service_worker_unregister_and_register(t, 'resources/empty-worker.js')
+    .then(function(registration) {
+      return wait_for_update(t, registration);
+    })
     .then(function(sw) {
       state_promise = wait_for_state(t, sw, 'redundant');
       return navigator.serviceWorker.unregister();