Standardize usage of virtual/override/final in chrome/

chrome/common/icon_with_badge_image_source.h

Index: chrome/common/icon_with_badge_image_source.h
diff --git a/chrome/common/icon_with_badge_image_source.h b/chrome/common/icon_with_badge_image_source.h
index 87bf9df79771c8ebab6fc24ee6754fb33768a479..f120a0a770d67c625b00b588de925a3986172460 100644
--- a/chrome/common/icon_with_badge_image_source.h
+++ b/chrome/common/icon_with_badge_image_source.h
@@ -27,10 +27,10 @@ class IconWithBadgeImageSource
       const SkColor& text_color,
       const SkColor& background_color,
       extensions::ActionInfo::Type action_type);
-  virtual ~IconWithBadgeImageSource();
+  ~IconWithBadgeImageSource() override;
 
  private:
-  virtual void Draw(gfx::Canvas* canvas) override;
+  void Draw(gfx::Canvas* canvas) override;
 
   // Browser action icon image.
   gfx::ImageSkia icon_;