Added default implementations of GetAcceleratorForCommandId.

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 "base/macros.h"
 #include "ui/app_list/app_list_view_delegate.h"
 #include "ui/base/models/simple_menu_model.h"
@@ skipping 17 matching lines @@
   explicit AppListMenu(AppListViewDelegate* delegate);
   ~AppListMenu() override;
 
   ui::SimpleMenuModel* menu_model() { return &menu_model_; }
 
  private:
   void InitMenu();
 
   bool IsCommandIdChecked(int command_id) const override;
   bool IsCommandIdEnabled(int command_id) const override;
-  bool GetAcceleratorForCommandId(int command_id,
-                                  ui::Accelerator* accelerator) const 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_