Revert of Service Worker: Make ServiceWorkerRegistration.update() return a promise. (Blink 1/3)

public/platform/WebServiceWorkerRegistration.h

Index: public/platform/WebServiceWorkerRegistration.h
diff --git a/public/platform/WebServiceWorkerRegistration.h b/public/platform/WebServiceWorkerRegistration.h
index a55d35f9e48181fde3be61c271d742c590a022aa..53790805cf2833d0e2d71d629bfa72f71e610844 100644
--- a/public/platform/WebServiceWorkerRegistration.h
+++ b/public/platform/WebServiceWorkerRegistration.h
@@ -18,7 +18,6 @@
 public:
     virtual ~WebServiceWorkerRegistration() { }
 
-    using WebServiceWorkerUpdateCallbacks = WebCallbacks<void, WebServiceWorkerError*>;
     using WebServiceWorkerUnregistrationCallbacks = WebCallbacks<bool*, WebServiceWorkerError*>;
 
     virtual void setProxy(WebServiceWorkerRegistrationProxy*) { }
@@ -26,14 +25,7 @@
     virtual void proxyStopped() { }
 
     virtual WebURL scope() const { return WebURL(); }
-    // TODO(jungkees):
-    // void update(p) remains temporarily before the chromium-side companion
-    // patch lands: https://codereview.chromium.org/1270513002/.
-    // Before the chromium-side patch lands, the new update(p, c) will
-    // internally call this->update(p) to work with the existing code base.
-    // The final changes will be incorporated with the Blink layout patches.
     virtual void update(WebServiceWorkerProvider*) { }
-    virtual void update(WebServiceWorkerProvider* provider, WebServiceWorkerUpdateCallbacks*) { this->update(provider); }
     virtual void unregister(WebServiceWorkerProvider*, WebServiceWorkerUnregistrationCallbacks*) { }
 };