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

chromeos/login/auth/online_attempt_host.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROMEOS_LOGIN_AUTH_ONLINE_ATTEMPT_HOST_H_
 #define CHROMEOS_LOGIN_AUTH_ONLINE_ATTEMPT_HOST_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 16 matching lines @@
 // Helper class which hosts OnlineAttempt for online credentials checking.
 class CHROMEOS_EXPORT OnlineAttemptHost : public AuthAttemptStateResolver {
  public:
   class Delegate {
    public:
     // Called after user_context were checked online.
     virtual void OnChecked(const std::string& username, bool success) = 0;
   };
 
   explicit OnlineAttemptHost(Delegate* delegate);
-  virtual ~OnlineAttemptHost();
+  ~OnlineAttemptHost() override;
 
   // Performs an online check of the credentials in |request_context| and
   // invokes
   // the delegate's OnChecked() with the result. Note that only one check can be
   // in progress at any given time. If this method is invoked with a different
   // |user_context| than a check currently in progress, the current check will
   // be silently aborted.
   void Check(net::URLRequestContextGetter* request_context,
              const UserContext& user_context);
 
   // Resets the checking process.
   void Reset();
 
   // AuthAttemptStateResolver overrides.
   // Executed on IO thread.
-  virtual void Resolve() override;
+  void Resolve() override;
 
   // Does an actual resolve on UI thread.
   void ResolveOnUIThread(bool success);
 
  private:
   scoped_refptr<base::MessageLoopProxy> message_loop_;
   Delegate* delegate_;
   UserContext current_attempt_user_context_;
   scoped_ptr<OnlineAttempt> online_attempt_;
   scoped_ptr<AuthAttemptState> state_;
   base::WeakPtrFactory<OnlineAttemptHost> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OnlineAttemptHost);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_LOGIN_AUTH_ONLINE_ATTEMPT_HOST_H_