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

remoting/host/win/rdp_client.cc

Index: remoting/host/win/rdp_client.cc
diff --git a/remoting/host/win/rdp_client.cc b/remoting/host/win/rdp_client.cc
index f41db108e959dcd658a7282db7783a7dd1781d97..8f029ef599be8807d08deda3bb93a40a438f62e5 100644
--- a/remoting/host/win/rdp_client.cc
+++ b/remoting/host/win/rdp_client.cc
@@ -56,12 +56,12 @@ class RdpClient::Core
   void InjectSas();
 
   // RdpClientWindow::EventHandler interface.
-  virtual void OnConnected() override;
-  virtual void OnDisconnected() override;
+  void OnConnected() override;
+  void OnDisconnected() override;
 
  private:
   friend class base::RefCountedThreadSafe<Core>;
-  virtual ~Core();
+  ~Core() override;
 
   // Helpers for the event handler's methods that make sure that OnRdpClosed()
   // is the last notification delivered and is delevered only once.