ServiceWorker: Enable ServiceWorkerRegistration and update layout tests

LayoutTests/http/tests/serviceworker/resources/fetch-mixed-content-iframe.html

Index: LayoutTests/http/tests/serviceworker/resources/fetch-mixed-content-iframe.html
diff --git a/LayoutTests/http/tests/serviceworker/resources/fetch-mixed-content-iframe.html b/LayoutTests/http/tests/serviceworker/resources/fetch-mixed-content-iframe.html
index 244972ce67513da71f834e3ff1e7725ddcf50070..ec9612df3d683d920717232cc58f5753316e973c 100644
--- a/LayoutTests/http/tests/serviceworker/resources/fetch-mixed-content-iframe.html
+++ b/LayoutTests/http/tests/serviceworker/resources/fetch-mixed-content-iframe.html
@@ -11,6 +11,13 @@ navigator.serviceWorker.unregister(SCOPE)
   .then(function() {
       return navigator.serviceWorker.register(URL, {scope: SCOPE});
     })
+  .then(function(registration) {
+      return new Promise(function(resolve, reject) {
+          registration.addEventListener('updatefound', function() {
+              resolve(registration.installing);

[falken, 2014/08/14 10:16:36]

this promise is just wait_for_update()?

[nhiroki, 2014/08/14 13:22:07]

I think we cannot call wait_for_update() here since there is no 'test' object.

+            });
+        });
+    })
   .then(function(worker) {
       worker.addEventListener('statechange', on_state_change);
     });