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

chromeos/login/auth/online_attempt_host.h

Index: chromeos/login/auth/online_attempt_host.h
diff --git a/chromeos/login/auth/online_attempt_host.h b/chromeos/login/auth/online_attempt_host.h
index da392450424da68a578fe883776063b4e9c5ec5d..ee9fcb9cef7d2cfbe5769c1e01e53dfbd0409f63 100644
--- a/chromeos/login/auth/online_attempt_host.h
+++ b/chromeos/login/auth/online_attempt_host.h
@@ -34,7 +34,7 @@ class CHROMEOS_EXPORT OnlineAttemptHost : public AuthAttemptStateResolver {
   };
 
   explicit OnlineAttemptHost(Delegate* delegate);
-  virtual ~OnlineAttemptHost();
+  ~OnlineAttemptHost() override;
 
   // Performs an online check of the credentials in |request_context| and
   // invokes
@@ -50,7 +50,7 @@ class CHROMEOS_EXPORT OnlineAttemptHost : public AuthAttemptStateResolver {
 
   // AuthAttemptStateResolver overrides.
   // Executed on IO thread.
-  virtual void Resolve() override;
+  void Resolve() override;
 
   // Does an actual resolve on UI thread.
   void ResolveOnUIThread(bool success);