Standardize usage of virtual/override/final in remoting/

remoting/protocol/negotiating_client_authenticator.h

Index: remoting/protocol/negotiating_client_authenticator.h
diff --git a/remoting/protocol/negotiating_client_authenticator.h b/remoting/protocol/negotiating_client_authenticator.h
index c110a8592072573147c2d1514274dc06572d27f1..699f4d3f12acffe5d87f65bee6e52877040b4d85 100644
--- a/remoting/protocol/negotiating_client_authenticator.h
+++ b/remoting/protocol/negotiating_client_authenticator.h
@@ -32,12 +32,12 @@ class NegotiatingClientAuthenticator : public NegotiatingAuthenticatorBase {
       scoped_ptr<ThirdPartyClientAuthenticator::TokenFetcher> token_fetcher_,
       const std::vector<AuthenticationMethod>& methods);
 
-  virtual ~NegotiatingClientAuthenticator();
+  ~NegotiatingClientAuthenticator() override;
 
   // Overriden from Authenticator.
-  virtual void ProcessMessage(const buzz::XmlElement* message,
-                              const base::Closure& resume_callback) override;
-  virtual scoped_ptr<buzz::XmlElement> GetNextMessage() override;
+  void ProcessMessage(const buzz::XmlElement* message,
+                      const base::Closure& resume_callback) override;
+  scoped_ptr<buzz::XmlElement> GetNextMessage() override;
 
  private:
   // (Asynchronously) creates an authenticator, and stores it in