content: Cleanup class/struct forward declarations

content/child/service_worker/web_service_worker_registration_impl.h

 // Copyright 2014 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_WEB_SERVICE_WORKER_REGISTRATION_IMPL_H_
 #define CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_REGISTRATION_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorkerRegistration.h"
 
 namespace blink {
 class WebServiceWorkerRegistrationProxy;
 }
 
 namespace content {
 
 class ServiceWorkerRegistrationHandleReference;
-class ThreadSafeSender;
 class WebServiceWorkerImpl;
-struct ServiceWorkerObjectInfo;
 
 // Each instance corresponds to one ServiceWorkerRegistration object in JS
 // context, and is held by ServiceWorkerRegistration object in Blink's C++ layer
 // via WebServiceWorkerRegistration::Handle.
 //
 // Each instance holds one ServiceWorkerRegistrationHandleReference so that
 // corresponding ServiceWorkerRegistrationHandle doesn't go away in the browser
 // process while the ServiceWorkerRegistration object is alive.
 class CONTENT_EXPORT WebServiceWorkerRegistrationImpl
     : NON_EXPORTED_BASE(public blink::WebServiceWorkerRegistration),
@@ skipping 73 matching lines @@
   blink::WebServiceWorkerRegistrationProxy* proxy_;
 
   std::vector<QueuedTask> queued_tasks_;
 
   DISALLOW_COPY_AND_ASSIGN(WebServiceWorkerRegistrationImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_REGISTRATION_IMPL_H_