Standardize usage of virtual/override/final in chrome/browser/supervised_user/

chrome/browser/supervised_user/supervised_user_theme.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_SUPERVISED_USER_SUPERVISED_USER_THEME_H_
 #define CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_THEME_H_
 
 #include "chrome/browser/supervised_user/supervised_users.h"
 #include "chrome/browser/themes/custom_theme_supplier.h"
 
 namespace gfx {
 class Image;
 }
 
 // This theme is used as a default theme for supervised users. It uses a light
 // blue as frame color, and defines color properties for the avatar label.
 class SupervisedUserTheme : public CustomThemeSupplier {
  public:
   SupervisedUserTheme();
 
   // Overridden from CustomThemeSupplier:
-  virtual bool GetColor(int id, SkColor* color) const override;
-  virtual gfx::Image GetImageNamed(int id) override;
-  virtual bool HasCustomImage(int id) const override;
+  bool GetColor(int id, SkColor* color) const override;
+  gfx::Image GetImageNamed(int id) override;
+  bool HasCustomImage(int id) const override;
 
  private:
-  virtual ~SupervisedUserTheme();
+  ~SupervisedUserTheme() override;
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserTheme);
 };
 
 #endif  // CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_THEME_H_