Standardize usage of virtual/override/final in ui/

ui/app_list/app_list_menu.h

Index: ui/app_list/app_list_menu.h
diff --git a/ui/app_list/app_list_menu.h b/ui/app_list/app_list_menu.h
index 738ab1eb2b937fa1a9ea1e053c343f2189248ce7..5dc5a2de43cd2481ac2429c789d138a330bdfbd3 100644
--- a/ui/app_list/app_list_menu.h
+++ b/ui/app_list/app_list_menu.h
@@ -25,19 +25,18 @@ class AppListMenu : public ui::SimpleMenuModel::Delegate {
   };
 
   explicit AppListMenu(AppListViewDelegate* delegate);
-  virtual ~AppListMenu();
+  ~AppListMenu() override;
 
   ui::SimpleMenuModel* menu_model() { return &menu_model_; }
 
  private:
   void InitMenu();
 
-  virtual bool IsCommandIdChecked(int command_id) const override;
-  virtual bool IsCommandIdEnabled(int command_id) const override;
-  virtual bool GetAcceleratorForCommandId(
-      int command_id,
-      ui::Accelerator* accelerator) override;
-  virtual void ExecuteCommand(int command_id, int event_flags) override;
+  bool IsCommandIdChecked(int command_id) const override;
+  bool IsCommandIdEnabled(int command_id) const override;
+  bool GetAcceleratorForCommandId(int command_id,
+                                  ui::Accelerator* accelerator) override;
+  void ExecuteCommand(int command_id, int event_flags) override;
 
   ui::SimpleMenuModel menu_model_;
   AppListViewDelegate* delegate_;