Standardize usage of virtual/override/final in ui/

ui/app_list/app_list_menu.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_APP_LIST_APP_LIST_MENU_H_
 #define UI_APP_LIST_APP_LIST_MENU_H_
 
 #include "ui/app_list/app_list_view_delegate.h"
 #include "ui/base/models/simple_menu_model.h"
 
 namespace app_list {
 
 // Menu for the app list. This is shown in the top right hand corner of the
 // app list.
 // TODO(benwells): We should consider moving this into Chrome.
 class AppListMenu : public ui::SimpleMenuModel::Delegate {
  public:
   enum AppListMenuCommands {
     SHOW_SETTINGS,
     SHOW_HELP,
     SHOW_FEEDBACK,
     // |SELECT_PROFILE| must remain the last enum because values greater than
     // |SELECT_PROFILE| are used to indicate a profile index.
     SELECT_PROFILE,
   };
 
   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_;
   AppListViewDelegate::Users users_;
 
   DISALLOW_COPY_AND_ASSIGN(AppListMenu);
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_MENU_H_