Standardize usage of virtual/override/final in ui/

ui/app_list/pagination_model.h

Index: ui/app_list/pagination_model.h
diff --git a/ui/app_list/pagination_model.h b/ui/app_list/pagination_model.h
index 1447559361f263357437b8b659f5ec987044a3ba..13c47ab85d5427aed3ef605b0d972c9cae8feb42 100644
--- a/ui/app_list/pagination_model.h
+++ b/ui/app_list/pagination_model.h
@@ -49,7 +49,7 @@ class APP_LIST_EXPORT PaginationModel : public gfx::AnimationDelegate {
   };
 
   PaginationModel();
-  virtual ~PaginationModel();
+  ~PaginationModel() override;
 
   void SetTotalPages(int total_pages);
 
@@ -122,8 +122,8 @@ class APP_LIST_EXPORT PaginationModel : public gfx::AnimationDelegate {
   void ResetTransitionAnimation();
 
   // gfx::AnimationDelegate overrides:
-  virtual void AnimationProgressed(const gfx::Animation* animation) override;
-  virtual void AnimationEnded(const gfx::Animation* animation) override;
+  void AnimationProgressed(const gfx::Animation* animation) override;
+  void AnimationEnded(const gfx::Animation* animation) override;
 
   int total_pages_;
   int selected_page_;