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

remoting/host/curtain_mode_win.cc

 // 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.
 
 #include "remoting/host/curtain_mode.h"
 
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/win/windows_version.h"
 #include "remoting/host/client_session_control.h"
 
 namespace remoting {
 
 class CurtainModeWin : public CurtainMode {
  public:
   CurtainModeWin();
 
   // Overriden from CurtainMode.
-  virtual bool Activate() override;
+  bool Activate() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CurtainModeWin);
 };
 
 CurtainModeWin::CurtainModeWin() {
 }
 
 bool CurtainModeWin::Activate() {
   if (base::win::GetVersion() < base::win::VERSION_VISTA) {
@@ skipping 17 matching lines @@
     scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
     base::WeakPtr<ClientSessionControl> client_session_control) {
   // |client_session_control| is not used because the client session is
   // disconnected as soon as the session is re-attached to the local console.
   // See RdpDesktopSession for more details.
   return make_scoped_ptr(new CurtainModeWin());
 }
 
 }  // namespace remoting