blink: Cleanup class/struct forward declarations

third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorkerProvider.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 22 matching lines @@
 
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/WebVector.h"
 #include "public/platform/modules/serviceworker/WebServiceWorkerRegistration.h"
 
 #include <memory>
 
 namespace blink {
 
 class WebURL;
-class WebServiceWorker;
 class WebServiceWorkerProviderClient;
 struct WebServiceWorkerError;
 
 // Created on the main thread, and may be passed to another script context
 // thread (e.g. worker thread) later. All methods of this class must be called
 // on the single script context thread.
 class WebServiceWorkerProvider {
  public:
   // Called when a client wants to start listening to the service worker
   // events. Must be cleared before the client becomes invalid.
@@ skipping 29 matching lines @@
                                          WebString* errorMessage) {
     return false;
   }
 
   virtual ~WebServiceWorkerProvider() {}
 };
 
 }  // namespace blink
 
 #endif