Remove old Authentication code that we don't use or need.

remoting/protocol/client_control_sender.h

 // Copyright (c) 2011 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.
 
 // Implementation of ClientStub using sockets created from jingle connection.
 // It sends messages through the socket after serializing it.
 //
 // Object of this class can only be created by ConnectionToClient.
 //
 // This class can be used on any thread.
@@ skipping 23 matching lines @@
 
 // Implementation of ClientStub that sends commands on a socket. Must
 // be created and closed on the network thread, but can be used on any
 // other thread.
 class ClientControlSender : public ClientStub {
  public:
   explicit ClientControlSender(base::MessageLoopProxy* message_loop,
                                net::Socket* socket);
   virtual ~ClientControlSender();
 
-  virtual void BeginSessionResponse(const LocalLoginStatus* msg,
-                                    const base::Closure& done) OVERRIDE;
-
   // Stop writing. Must be called on the network thread when the
   // underlying socket is being destroyed.
   void Close();
 
  private:
   // Buffered socket writer holds the serialized message and send it on the
   // right thread.
   scoped_refptr<BufferedSocketWriter> buffered_writer_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientControlSender);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_CLIENT_STUB_IMPL_H_