chrome: Cleanup class/struct forward declarations

chrome/renderer/media/cast_session.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 CHROME_RENDERER_MEDIA_CAST_SESSION_H_
 #define CHROME_RENDERER_MEDIA_CAST_SESSION_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "media/cast/cast_config.h"
 #include "net/base/ip_endpoint.h"
 
 namespace base {
 class BinaryValue;
 class DictionaryValue;
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace media {
-class VideoFrame;
 namespace cast {
 class AudioFrameInput;
 class VideoFrameInput;
 }  // namespace cast
 }  // namespace media
 
-namespace content {
-class P2PSocketClient;
-}  // namespace content
-
 class CastSessionDelegate;
 
 // This class represents a Cast session and allows the session to be
 // configured on the main thread. Actual work is forwarded to
 // CastSessionDelegate on the IO thread.
 class CastSession : public base::RefCounted<CastSession> {
  public:
   using AudioFrameInputAvailableCallback =
       base::Callback<void(const scoped_refptr<media::cast::AudioFrameInput>&)>;
   using VideoFrameInputAvailableCallback =
@@ skipping 62 matching lines @@
   // because it is owned by this object.
   std::unique_ptr<CastSessionDelegate> delegate_;
 
   // Proxy to the IO task runner.
   const scoped_refptr<base::SingleThreadTaskRunner> io_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(CastSession);
 };
 
 #endif  // CHROME_RENDERER_MEDIA_CAST_SESSION_H_