Standardize usage of virtual/override/final in remoting/

remoting/protocol/pairing_client_authenticator.h

Index: remoting/protocol/pairing_client_authenticator.h
diff --git a/remoting/protocol/pairing_client_authenticator.h b/remoting/protocol/pairing_client_authenticator.h
index 5b0cf5d2baf466b5cd7a02c23e13ca22aa8ee3ba..1696073859cb4cd0e793ebbe3c5ca51952eb9896 100644
--- a/remoting/protocol/pairing_client_authenticator.h
+++ b/remoting/protocol/pairing_client_authenticator.h
@@ -18,14 +18,14 @@ class PairingClientAuthenticator : public PairingAuthenticatorBase {
       const std::string& paired_secret,
       const FetchSecretCallback& fetch_pin_callback,
       const std::string& authentication_tag);
-  virtual ~PairingClientAuthenticator();
+  ~PairingClientAuthenticator() override;
 
  private:
   // PairingAuthenticatorBase interface.
-  virtual void CreateV2AuthenticatorWithPIN(
+  void CreateV2AuthenticatorWithPIN(
       State initial_state,
       const SetAuthenticatorCallback& callback) override;
-  virtual void AddPairingElements(buzz::XmlElement* message) override;
+  void AddPairingElements(buzz::XmlElement* message) override;
 
   void OnPinFetched(State initial_state,
                     const SetAuthenticatorCallback& callback,