remoting: Cleanup class/struct fwd declarations

remoting/protocol/host_stub.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.
 
 // Interface of a host that receives commands from a Chromoting client.
 //
 // This interface handles control messages defined in control.proto.
 
 #ifndef REMOTING_PROTOCOL_HOST_STUB_H_
 #define REMOTING_PROTOCOL_HOST_STUB_H_
 
 #include "base/macros.h"
 
 namespace remoting {
 namespace protocol {
 
 class AudioControl;
 class Capabilities;
 class ClientResolution;
 class ExtensionMessage;
-class PairingResponse;
 class PairingRequest;
 class VideoControl;
 
 class HostStub {
  public:
   HostStub() {}
 
   // Notification of the client dimensions and pixel density.
   // This may be used to resize the host display to match the client area.
   virtual void NotifyClientResolution(const ClientResolution& resolution) = 0;
@@ skipping 19 matching lines @@
   virtual ~HostStub() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HostStub);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_HOST_STUB_H_