remoting: Cleanup class/struct fwd declarations

remoting/protocol/client_video_stats_dispatcher.h

 // Copyright 2016 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 REMOTING_PROTOCOL_CLIENT_VIDEO_STATE_DISPATCHER_H_
 #define REMOTING_PROTOCOL_CLIENT_VIDEO_STATE_DISPATCHER_H_
 
 #include <list>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "remoting/base/constants.h"
 #include "remoting/protocol/channel_dispatcher_base.h"
 #include "third_party/webrtc/modules/desktop_capture/desktop_geometry.h"
 
 namespace remoting {
 namespace protocol {
 
-class ClientStub;
 class VideoStatsStub;
 
 class ClientVideoStatsDispatcher : public ChannelDispatcherBase {
  public:
   ClientVideoStatsDispatcher(const std::string& stream_name,
                              VideoStatsStub* video_stats_stub);
   ~ClientVideoStatsDispatcher() override;
 
  private:
   void OnIncomingMessage(std::unique_ptr<CompoundBuffer> message) override;
 
   VideoStatsStub* video_stats_stub_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientVideoStatsDispatcher);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_CLIENT_VIDEO_STATE_DISPATCHER_H_