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

chrome/browser/chromeos/app_mode/certificate_manager_dialog.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 CHROME_BROWSER_CHROMEOS_APP_MODE_CERTIFICATE_MANAGER_DIALOG_H_
 #define CHROME_BROWSER_CHROMEOS_APP_MODE_CERTIFICATE_MANAGER_DIALOG_H_
 
 #include "chrome/browser/chromeos/login/ui/login_web_dialog.h"
 #include "ui/gfx/native_widget_types.h"
 
 class Profile;
 
 namespace chromeos {
 
 // This dialog is used to manage user certificates from the kiosk launch screen.
 class CertificateManagerDialog : public LoginWebDialog {
  public:
   CertificateManagerDialog(Profile* profile,
                            LoginWebDialog::Delegate* delegate,
                            gfx::NativeWindow window);
-  virtual ~CertificateManagerDialog();
+  ~CertificateManagerDialog() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(CertificateManagerDialog);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_APP_MODE_CERTIFICATE_MANAGER_DIALOG_H_