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

remoting/protocol/client_message_dispatcher.cc

 // 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.
 
 #include "base/memory/ref_counted.h"
 #include "net/base/io_buffer.h"
 #include "remoting/proto/control.pb.h"
 #include "remoting/proto/event.pb.h"
 #include "remoting/proto/internal.pb.h"
 #include "remoting/protocol/client_message_dispatcher.h"
@@ skipping 22 matching lines @@
 
   control_message_reader_->Init(
       session->control_channel(),
       base::Bind(&ClientMessageDispatcher::OnControlMessageReceived,
                  base::Unretained(this)));
   return;
 }
 
 void ClientMessageDispatcher::OnControlMessageReceived(
     ControlMessage* message, const base::Closure& done_task) {
-  if (message->has_begin_session_response()) {
-    const BeginSessionResponse& response = message->begin_session_response();
-    if (response.has_login_status() &&
-        response.login_status().has_success()) {
-      client_stub_->BeginSessionResponse(
-          &response.login_status(), done_task);
-      return;
-    }
-  }
 
   LOG(WARNING) << "Invalid control message received.";
-
   done_task.Run();
 }
 
 }  // namespace protocol
 }  // namespace remoting