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

device/serial/serial_io_handler_win.h

 // Copyright 2014 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 DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_
 #define DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "device/serial/serial_io_handler.h"
 
 namespace device {
 
 class SerialIoHandlerWin : public SerialIoHandler,
                            public base::MessageLoopForIO::IOHandler {
  protected:
   // SerialIoHandler implementation.
-  virtual void ReadImpl() override;
-  virtual void WriteImpl() override;
-  virtual void CancelReadImpl() override;
-  virtual void CancelWriteImpl() override;
-  virtual bool ConfigurePortImpl() override;
-  virtual bool Flush() const override;
-  virtual serial::DeviceControlSignalsPtr GetControlSignals() const override;
-  virtual bool SetControlSignals(
+  void ReadImpl() override;
+  void WriteImpl() override;
+  void CancelReadImpl() override;
+  void CancelWriteImpl() override;
+  bool ConfigurePortImpl() override;
+  bool Flush() const override;
+  serial::DeviceControlSignalsPtr GetControlSignals() const override;
+  bool SetControlSignals(
       const serial::HostControlSignals& control_signals) override;
-  virtual serial::ConnectionInfoPtr GetPortInfo() const override;
-  virtual bool PostOpen() override;
+  serial::ConnectionInfoPtr GetPortInfo() const override;
+  bool PostOpen() override;
 
  private:
   friend class SerialIoHandler;
 
   explicit SerialIoHandlerWin(
       scoped_refptr<base::MessageLoopProxy> file_thread_message_loop,
       scoped_refptr<base::MessageLoopProxy> ui_thread_message_loop);
-  virtual ~SerialIoHandlerWin();
+  ~SerialIoHandlerWin() override;
 
   // base::MessageLoopForIO::IOHandler implementation.
-  virtual void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
-                             DWORD bytes_transfered,
-                             DWORD error) override;
+  void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
+                     DWORD bytes_transfered,
+                     DWORD error) override;
 
   // Context used for asynchronous WaitCommEvent calls.
   scoped_ptr<base::MessageLoopForIO::IOContext> comm_context_;
 
   // Context used for overlapped reads.
   scoped_ptr<base::MessageLoopForIO::IOContext> read_context_;
 
   // Context used for overlapped writes.
   scoped_ptr<base::MessageLoopForIO::IOContext> write_context_;
 
   // Asynchronous event mask state
   DWORD event_mask_;
 
   // Indicates if a pending read is waiting on initial data arrival via
   // WaitCommEvent, as opposed to waiting on actual ReadFile completion
   // after a corresponding WaitCommEvent has completed.
   bool is_comm_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(SerialIoHandlerWin);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_SERIAL_SERIAL_IO_HANDLER_WIN_H_