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

remoting/protocol/host_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 HostStub using sockets created from jingle connection.
 // It sends messages through the socket after serializing it.
 //
 // Object of this class can only be created by ConnectionToHost.
 //
 // This class can be used on any thread.
@@ skipping 21 matching lines @@
 
 // Implementation of HostStub that sends commands on a socket. Must be
 // created and closed on the network thread, but can be used on any
 // other thread.
 class HostControlSender : public HostStub {
  public:
   explicit HostControlSender(base::MessageLoopProxy* message_loop,
                              net::Socket* socket);
   virtual ~HostControlSender();
 
-  virtual void BeginSessionRequest(
-      const LocalLoginCredentials* credentials, const base::Closure& done);
-
   // 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(HostControlSender);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_HOST_STUB_IMPL_H_