Revert of ServiceWorker: Implement ServiceWorkerRegistration.update() (1)

public/platform/WebServiceWorkerProvider.h

Index: public/platform/WebServiceWorkerProvider.h
diff --git a/public/platform/WebServiceWorkerProvider.h b/public/platform/WebServiceWorkerProvider.h
index 8f5021115167817695521eb78ac41904c204ea4a..ce600c50206a661cecf36bf815fc2b19843cea0a 100644
--- a/public/platform/WebServiceWorkerProvider.h
+++ b/public/platform/WebServiceWorkerProvider.h
@@ -58,8 +58,10 @@
     typedef WebCallbacks<WebServiceWorkerRegistration, void> WebServiceWorkerGetRegistrationForReadyCallbacks;
 
     virtual void registerServiceWorker(const WebURL& pattern, const WebURL& scriptUrl, WebServiceWorkerRegistrationCallbacks*) { }
-    virtual void updateServiceWorker(const WebURL& pattern) { }
+
+    // Unregisters the ServiceWorker for a given scope.
     virtual void unregisterServiceWorker(const WebURL& pattern, WebServiceWorkerUnregistrationCallbacks*) { }
+
     virtual void getRegistration(const WebURL& documentURL, WebServiceWorkerGetRegistrationCallbacks*) { }
     virtual void getRegistrationForReady(WebServiceWorkerGetRegistrationForReadyCallbacks*) { }