content: Cleanup class/struct forward declarations

content/child/service_worker/service_worker_dispatcher.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_DISPATCHER_H_
 #define CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_DISPATCHER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 19 matching lines @@
 
 namespace IPC {
 class Message;
 }
 
 struct ServiceWorkerMsg_MessageToDocument_Params;
 
 namespace content {
 
 class ServiceWorkerHandleReference;
-class ServiceWorkerMessageFilter;
 class ServiceWorkerProviderContext;
 class ServiceWorkerRegistrationHandleReference;
 class ThreadSafeSender;
 class WebServiceWorkerImpl;
 class WebServiceWorkerRegistrationImpl;
 struct ServiceWorkerObjectInfo;
 struct ServiceWorkerRegistrationObjectInfo;
 struct ServiceWorkerVersionAttributes;
 
 // This class manages communication with the browser process about
@@ skipping 278 matching lines @@
 
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_DISPATCHER_H_