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

remoting/host/pairing_registry_delegate_win.h

Index: remoting/host/pairing_registry_delegate_win.h
diff --git a/remoting/host/pairing_registry_delegate_win.h b/remoting/host/pairing_registry_delegate_win.h
index 9f9d4dce2d5411b5894927f177cb08b5b76b3678..f7cf832b335dbf6388745a83d50d6915e74f6aeb 100644
--- a/remoting/host/pairing_registry_delegate_win.h
+++ b/remoting/host/pairing_registry_delegate_win.h
@@ -44,7 +44,7 @@ class PairingRegistryDelegateWin
     : public protocol::PairingRegistry::Delegate {
  public:
   PairingRegistryDelegateWin();
-  virtual ~PairingRegistryDelegateWin();
+  ~PairingRegistryDelegateWin() override;
 
   // Passes the root keys to be used to access the pairing registry store.
   // |privileged| is optional and may be nullptr. The caller retains ownership
@@ -52,12 +52,12 @@ class PairingRegistryDelegateWin
   bool SetRootKeys(HKEY privileged, HKEY unprivileged);
 
   // PairingRegistry::Delegate interface
-  virtual scoped_ptr<base::ListValue> LoadAll() override;
-  virtual bool DeleteAll() override;
-  virtual protocol::PairingRegistry::Pairing Load(
+  scoped_ptr<base::ListValue> LoadAll() override;
+  bool DeleteAll() override;
+  protocol::PairingRegistry::Pairing Load(
       const std::string& client_id) override;
-  virtual bool Save(const protocol::PairingRegistry::Pairing& pairing) override;
-  virtual bool Delete(const std::string& client_id) override;
+  bool Save(const protocol::PairingRegistry::Pairing& pairing) override;
+  bool Delete(const std::string& client_id) override;
 
  private:
   base::win::RegKey privileged_;