remoting: Cleanup class/struct fwd declarations

remoting/protocol/host_event_dispatcher.h

 // Copyright (c) 2012 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_HOST_EVENT_DISPATCHER_H_
 #define REMOTING_PROTOCOL_HOST_EVENT_DISPATCHER_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
 #include "remoting/protocol/channel_dispatcher_base.h"
 #include "remoting/protocol/input_event_timestamps.h"
 
 namespace remoting {
 namespace protocol {
 
-class EventMessage;
 class InputStub;
 
 // HostEventDispatcher dispatches incoming messages on the event
 // channel to InputStub.
 class HostEventDispatcher : public ChannelDispatcherBase {
  public:
   HostEventDispatcher();
   ~HostEventDispatcher() override;
 
   // Set InputStub that will be called for each incoming input
@@ skipping 20 matching lines @@
 
   InputStub* input_stub_ = nullptr;
 
   DISALLOW_COPY_AND_ASSIGN(HostEventDispatcher);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_HOST_EVENT_DISPATCHER_H_