Standardize usage of virtual/override/final in remoting/

remoting/protocol/pairing_authenticator_base.h

Index: remoting/protocol/pairing_authenticator_base.h
diff --git a/remoting/protocol/pairing_authenticator_base.h b/remoting/protocol/pairing_authenticator_base.h
index 6000c4538d9d7620456466d8cd349fdc5a6d1ac8..0d5ac6fffabebed7c353d79d7f4245675fd198fe 100644
--- a/remoting/protocol/pairing_authenticator_base.h
+++ b/remoting/protocol/pairing_authenticator_base.h
@@ -39,17 +39,16 @@ namespace protocol {
 class PairingAuthenticatorBase : public Authenticator {
  public:
   PairingAuthenticatorBase();
-  virtual ~PairingAuthenticatorBase();
+  ~PairingAuthenticatorBase() override;
 
   // Authenticator interface.
-  virtual State state() const override;
-  virtual bool started() const override;
-  virtual RejectionReason rejection_reason() const override;
-  virtual void ProcessMessage(const buzz::XmlElement* message,
-                              const base::Closure& resume_callback) override;
-  virtual scoped_ptr<buzz::XmlElement> GetNextMessage() override;
-  virtual scoped_ptr<ChannelAuthenticator>
-      CreateChannelAuthenticator() const override;
+  State state() const override;
+  bool started() const override;
+  RejectionReason rejection_reason() const override;
+  void ProcessMessage(const buzz::XmlElement* message,
+                      const base::Closure& resume_callback) override;
+  scoped_ptr<buzz::XmlElement> GetNextMessage() override;
+  scoped_ptr<ChannelAuthenticator> CreateChannelAuthenticator() const override;
 
  protected:
   typedef base::Callback<void(scoped_ptr<Authenticator> authenticator)>