Remove unused ShelfModelObserver::ShelfStatusChanged()

ash/shelf/shelf_item_delegate_manager.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 ASH_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_
 #define ASH_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
@@ skipping 43 matching lines @@
                             scoped_ptr<ShelfItemDelegate> item_delegate);
 
   // Returns ShelfItemDelegate for |item_type|. Always returns non-NULL.
   ShelfItemDelegate* GetShelfItemDelegate(ShelfID id);
 
   // ShelfModelObserver overrides:
   void ShelfItemAdded(int model_index) override;
   void ShelfItemRemoved(int index, ShelfID id) override;
   void ShelfItemMoved(int start_index, int targetindex) override;
   void ShelfItemChanged(int index, const ShelfItem& old_item) override;
-  void ShelfStatusChanged() override;
 
  private:
   friend class test::ShelfItemDelegateManagerTestAPI;
 
   typedef std::map<ShelfID, ShelfItemDelegate*> ShelfIDToItemDelegateMap;
 
   // Remove and destroy ShelfItemDelegate for |id|.
   void RemoveShelfItemDelegate(ShelfID id);
 
   // Owned by Shell.
   ShelfModel* model_;
 
   ShelfIDToItemDelegateMap id_to_item_delegate_map_;
 
   base::ObserverList<ShelfItemDelegateManagerObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfItemDelegateManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_ITEM_DELEGATE_MANAGER_H_