Update {virtual,override} to follow C++11 style in cloud_print.

cloud_print/service/win/service_listener.h

 // Copyright 2013 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 CLOUD_PRINT_SERVICE_SERVICE_LISTENER_H_
 #define CLOUD_PRINT_SERVICE_SERVICE_LISTENER_H_
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "ipc/ipc_listener.h"
 
 namespace base {
 class Thread;
 }  // base
 
 namespace IPC {
 class Channel;
 }  // IPC
 
 // Simple IPC listener to run on service side to collect service environment and
 // to send back to setup utility.
 class ServiceListener : public IPC::Listener {
  public:
   explicit ServiceListener(const base::FilePath& user_data_dir);
-  virtual ~ServiceListener();
+  ~ServiceListener() override;
 
-  virtual bool OnMessageReceived(const IPC::Message& msg) override;
-  virtual void OnChannelConnected(int32 peer_pid) override;
+  bool OnMessageReceived(const IPC::Message& msg) override;
+  void OnChannelConnected(int32 peer_pid) override;
 
  private:
   void Disconnect();
   void Connect();
 
   scoped_ptr<base::Thread> ipc_thread_;
   scoped_ptr<IPC::Channel> channel_;
   base::FilePath user_data_dir_;
 };
 
 #endif  // CLOUD_PRINT_SERVICE_SERVICE_LISTENER_H_