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

chrome/browser/supervised_user/supervised_user_theme.h

Index: chrome/browser/supervised_user/supervised_user_theme.h
diff --git a/chrome/browser/supervised_user/supervised_user_theme.h b/chrome/browser/supervised_user/supervised_user_theme.h
index bbace96e9a1c8340a1ef217e978cf19f4b18db6f..85832fa17ac9c47c4d1097598675bcc849834ab5 100644
--- a/chrome/browser/supervised_user/supervised_user_theme.h
+++ b/chrome/browser/supervised_user/supervised_user_theme.h
@@ -19,12 +19,12 @@ class SupervisedUserTheme : public CustomThemeSupplier {
   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);
 };