Remove base::NonThreadSafe now that all users are gone!!

remoting/protocol/transport.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_PROTOCOL_TRANSPORT_H_
 #define REMOTING_PROTOCOL_TRANSPORT_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
 #include "net/base/ip_endpoint.h"
 #include "remoting/protocol/errors.h"
 
 namespace buzz {
 class XmlElement;
 }  // namespace buzz
 
 namespace remoting {
 namespace protocol {
 
@@ skipping 38 matching lines @@
   virtual void Start(
       Authenticator* authenticator,
       SendTransportInfoCallback send_transport_info_callback) = 0;
   virtual bool ProcessTransportInfo(buzz::XmlElement* transport_info) = 0;
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_TRANSPORT_H_