Simplify ConnectionToHost interface.

remoting/client/client_user_interface.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_CLIENT_CLIENT_USER_INTERFACE_H_
 #define REMOTING_CLIENT_CLIENT_USER_INTERFACE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "remoting/protocol/connection_to_host.h"
 #include "remoting/protocol/third_party_client_authenticator.h"
 
 namespace remoting {
 
 namespace protocol {
 class ClipboardStub;
 class CursorShapeStub;
+class ExtensionMessage;
 class PairingResponse;
 }  // namespace protocol
 
 // ClientUserInterface is an interface that must be implemented by
 // applications embedding the Chromoting client, to provide client's user
 // interface.
 //
 // TODO(sergeyu): Cleanup this interface, see crbug.com/138108 .
 class ClientUserInterface {
  public:
@@ skipping 21 matching lines @@
   // Get the view's ClipboardStub implementation.
   virtual protocol::ClipboardStub* GetClipboardStub() = 0;
 
   // Get the view's CursorShapeStub implementation.
   virtual protocol::CursorShapeStub* GetCursorShapeStub() = 0;
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_CLIENT_CLIENT_USER_INTERFACE_H_