Standardize usage of virtual/override/final specifiers.

ui/app_list/views/top_icon_animation_view.h

Index: ui/app_list/views/top_icon_animation_view.h
diff --git a/ui/app_list/views/top_icon_animation_view.h b/ui/app_list/views/top_icon_animation_view.h
index a3c12861c6f2a3c7e8a1cc71b0107d2cfb64d459..787b384e2219f8c393e7c54b905cbe3254dfc75e 100644
--- a/ui/app_list/views/top_icon_animation_view.h
+++ b/ui/app_list/views/top_icon_animation_view.h
@@ -41,7 +41,7 @@ class TopIconAnimationView : public views::View,
   TopIconAnimationView(const gfx::ImageSkia& icon,
                        const gfx::Rect& scaled_rect,
                        bool open_folder);
-  virtual ~TopIconAnimationView();
+  ~TopIconAnimationView() override;
 
   void AddObserver(TopIconAnimationObserver* observer);
   void RemoveObserver(TopIconAnimationObserver* observer);
@@ -54,12 +54,12 @@ class TopIconAnimationView : public views::View,
 
  private:
   // views::View overrides:
-  virtual gfx::Size GetPreferredSize() const override;
-  virtual void Layout() override;
+  gfx::Size GetPreferredSize() const override;
+  void Layout() override;
 
   // ui::ImplicitAnimationObserver overrides:
-  virtual void OnImplicitAnimationsCompleted() override;
-  virtual bool RequiresNotificationWhenAnimatorDestroyed() const override;
+  void OnImplicitAnimationsCompleted() override;
+  bool RequiresNotificationWhenAnimatorDestroyed() const override;
 
   gfx::Size icon_size_;
   views::ImageView* icon_;  // Owned by views hierarchy.