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

chromeos/cert_loader.h

 // Copyright (c) 2013 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_CERT_LOADER_H_
 #define CHROMEOS_CERT_LOADER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 74 matching lines @@
 
   // This will be empty until certificates_loaded() is true.
   const net::CertificateList& cert_list() const { return *cert_list_; }
 
   // Called in tests if |IsCertificateHardwareBacked()| should always return
   // true.
   static void ForceHardwareBackedForTesting();
 
  private:
   CertLoader();
-  virtual ~CertLoader();
+  ~CertLoader() override;
 
   // Trigger a certificate load. If a certificate loading task is already in
   // progress, will start a reload once the current task is finished.
   void LoadCertificates();
 
   // Called if a certificate load task is finished.
   void UpdateCertificates(scoped_ptr<net::CertificateList> cert_list);
 
   void NotifyCertificatesLoaded(bool initial_load);
 
   // net::CertDatabase::Observer
-  virtual void OnCACertChanged(const net::X509Certificate* cert) override;
-  virtual void OnCertAdded(const net::X509Certificate* cert) override;
-  virtual void OnCertRemoved(const net::X509Certificate* cert) override;
+  void OnCACertChanged(const net::X509Certificate* cert) override;
+  void OnCertAdded(const net::X509Certificate* cert) override;
+  void OnCertRemoved(const net::X509Certificate* cert) override;
 
   ObserverList<Observer> observers_;
 
   // Flags describing current CertLoader state.
   bool certificates_loaded_;
   bool certificates_update_required_;
   bool certificates_update_running_;
 
   // The user-specific NSS certificate database from which the certificates
   // should be loaded.
   net::NSSCertDatabase* database_;
 
   // Cached Certificates loaded from the database.
   scoped_ptr<net::CertificateList> cert_list_;
 
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<CertLoader> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CertLoader);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_CERT_LOADER_H_