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

remoting/protocol/client_control_sender.h

Index: remoting/protocol/client_control_sender.h
diff --git a/remoting/protocol/client_control_sender.h b/remoting/protocol/client_control_sender.h
index 4668a05934f15fffd259ce530fbade4a8d384e42..b26e99591a37927f13bbe33ea2dadec1eec6e87f 100644
--- a/remoting/protocol/client_control_sender.h
+++ b/remoting/protocol/client_control_sender.h
@@ -41,9 +41,6 @@ class ClientControlSender : public ClientStub {
                                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();