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

chromeos/cert_loader.h

Index: chromeos/cert_loader.h
diff --git a/chromeos/cert_loader.h b/chromeos/cert_loader.h
index d5421155621bbd7e915da42a65a5bf639296580f..92839186abef3519d68ffa85050dae3ea4b977be 100644
--- a/chromeos/cert_loader.h
+++ b/chromeos/cert_loader.h
@@ -92,7 +92,7 @@ class CHROMEOS_EXPORT CertLoader : public net::CertDatabase::Observer {
 
  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.
@@ -104,9 +104,9 @@ class CHROMEOS_EXPORT CertLoader : public net::CertDatabase::Observer {
   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_;