ServiceWorker: Route unregister() through WebServiceWorkerRegistration for refactoring (1)

public/platform/WebServiceWorkerProvider.h

Index: public/platform/WebServiceWorkerProvider.h
diff --git a/public/platform/WebServiceWorkerProvider.h b/public/platform/WebServiceWorkerProvider.h
index ca60a58314672b1972dd2b33fd46b46b5b74118d..1ba98964006fed35552dc0ee23318ab80154742d 100644
--- a/public/platform/WebServiceWorkerProvider.h
+++ b/public/platform/WebServiceWorkerProvider.h
@@ -54,14 +54,15 @@ public:
     // The WebServiceWorkerRegistration and WebServiceWorkerError ownership are
     // passed to the WebServiceWorkerRegistrationCallbacks implementation.
     typedef WebCallbacks<WebServiceWorkerRegistration, WebServiceWorkerError> WebServiceWorkerRegistrationCallbacks;
-    typedef WebCallbacks<bool, WebServiceWorkerError> WebServiceWorkerUnregistrationCallbacks;
     typedef WebCallbacks<WebServiceWorkerRegistration, WebServiceWorkerError> WebServiceWorkerGetRegistrationCallbacks;
     typedef WebCallbacks<WebVector<WebServiceWorkerRegistration*>, WebServiceWorkerError> WebServiceWorkerGetRegistrationsCallbacks;
     typedef WebCallbacks<WebServiceWorkerRegistration, void> WebServiceWorkerGetRegistrationForReadyCallbacks;
 
     virtual void registerServiceWorker(const WebURL& pattern, const WebURL& scriptUrl, WebServiceWorkerRegistrationCallbacks*) { }
 
-    // Unregisters the ServiceWorker for a given scope.
+    // TODO(nhiroki): Remove after http://crbug.com/500404 is fixed.
+#define CRBUG_500404
+    typedef WebCallbacks<bool, WebServiceWorkerError> WebServiceWorkerUnregistrationCallbacks;
     virtual void unregisterServiceWorker(const WebURL& pattern, WebServiceWorkerUnregistrationCallbacks*) { }
 
     virtual void getRegistration(const WebURL& documentURL, WebServiceWorkerGetRegistrationCallbacks*) { }