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

remoting/host/desktop_session_win.cc

Index: remoting/host/desktop_session_win.cc
diff --git a/remoting/host/desktop_session_win.cc b/remoting/host/desktop_session_win.cc
index c98f22936d210916e8c91afc11c18c11a8fb01c7..f3c0881d6230be455fadd0dc13220e1a3fe19652 100644
--- a/remoting/host/desktop_session_win.cc
+++ b/remoting/host/desktop_session_win.cc
@@ -91,14 +91,14 @@ class ConsoleSession : public DesktopSessionWin {
     DaemonProcess* daemon_process,
     int id,
     WtsTerminalMonitor* monitor);
-  virtual ~ConsoleSession();
+  ~ConsoleSession() override;
 
  protected:
   // DesktopSession overrides.
-  virtual void SetScreenResolution(const ScreenResolution& resolution) override;
+  void SetScreenResolution(const ScreenResolution& resolution) override;
 
   // DesktopSessionWin overrides.
-  virtual void InjectSas() override;
+  void InjectSas() override;
 
  private:
   scoped_ptr<SasInjector> sas_injector_;
@@ -119,7 +119,7 @@ class RdpSession : public DesktopSessionWin {
     DaemonProcess* daemon_process,
     int id,
     WtsTerminalMonitor* monitor);
-  virtual ~RdpSession();
+  ~RdpSession() override;
 
   // Performs the part of initialization that can fail.
   bool Initialize(const ScreenResolution& resolution);
@@ -130,10 +130,10 @@ class RdpSession : public DesktopSessionWin {
 
  protected:
   // DesktopSession overrides.
-  virtual void SetScreenResolution(const ScreenResolution& resolution) override;
+  void SetScreenResolution(const ScreenResolution& resolution) override;
 
   // DesktopSessionWin overrides.
-  virtual void InjectSas() override;
+  void InjectSas() override;
 
  private:
   // An implementation of IRdpDesktopSessionEventHandler interface that forwards