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

chromeos/login/auth/online_attempt.h

Index: chromeos/login/auth/online_attempt.h
diff --git a/chromeos/login/auth/online_attempt.h b/chromeos/login/auth/online_attempt.h
index e03684b8c5e2ab4f14809eccc2e5ffe631c93c03..032d2f5f3eebd2bd2064c3b16655bc97c46f5f68 100644
--- a/chromeos/login/auth/online_attempt.h
+++ b/chromeos/login/auth/online_attempt.h
@@ -31,7 +31,7 @@ class CHROMEOS_EXPORT OnlineAttempt : public GaiaAuthConsumer {
  public:
   OnlineAttempt(AuthAttemptState* current_attempt,
                 AuthAttemptStateResolver* callback);
-  virtual ~OnlineAttempt();
+  ~OnlineAttempt() override;
 
   // Initiate the online login attempt either through client or auth login.
   // Status will be recorded in |current_attempt|, and resolver_->Resolve() will
@@ -40,9 +40,8 @@ class CHROMEOS_EXPORT OnlineAttempt : public GaiaAuthConsumer {
   void Initiate(net::URLRequestContextGetter* request_context);
 
   // GaiaAuthConsumer overrides. Callbacks from GaiaAuthFetcher
-  virtual void OnClientLoginFailure(
-      const GoogleServiceAuthError& error) override;
-  virtual void OnClientLoginSuccess(
+  void OnClientLoginFailure(const GoogleServiceAuthError& error) override;
+  void OnClientLoginSuccess(
       const GaiaAuthConsumer::ClientLoginResult& credentials) override;
 
  private: