content: Cleanup class/struct forward declarations

content/child/service_worker/web_service_worker_impl.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_WEB_SERVICE_WORKER_IMPL_H_
 #define CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_IMPL_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebMessagePortChannel.h"
 #include "third_party/WebKit/public/platform/modules/serviceworker/WebServiceWorker.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 
 namespace blink {
 class WebServiceWorkerProxy;
 }
 
 namespace content {
 
 class ServiceWorkerHandleReference;
-struct ServiceWorkerObjectInfo;
 class ThreadSafeSender;
 
 // Each instance corresponds to one ServiceWorker object in JS context, and
 // is held by ServiceWorker object in Blink's C++ layer via
 // WebServiceWorker::Handle.
 //
 // Each instance holds one ServiceWorkerHandleReference so that
 // corresponding ServiceWorkerHandle doesn't go away in the browser process
 // while the ServiceWorker object is alive.
 class CONTENT_EXPORT WebServiceWorkerImpl
@@ skipping 29 matching lines @@
   blink::WebServiceWorkerState state_;
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   blink::WebServiceWorkerProxy* proxy_;
 
   DISALLOW_COPY_AND_ASSIGN(WebServiceWorkerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_IMPL_H_