Remove unused ShelfModelObserver::ShelfStatusChanged()

ash/shelf/shelf_view.h

 // Copyright (c) 2012 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_VIEW_H_
 #define ASH_SHELF_SHELF_VIEW_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 237 matching lines @@
   void GetAccessibleState(ui::AXViewState* state) override;
 
   // Overridden from ui::EventHandler:
   void OnGestureEvent(ui::GestureEvent* event) override;
 
   // Overridden from ShelfModelObserver:
   void ShelfItemAdded(int model_index) override;
   void ShelfItemRemoved(int model_index, ShelfID id) override;
   void ShelfItemChanged(int model_index, const ShelfItem& old_item) override;
   void ShelfItemMoved(int start_index, int target_index) override;
-  void ShelfStatusChanged() override;
 
   // Overridden from ShelfButtonHost:
   void PointerPressedOnButton(views::View* view,
                               Pointer pointer,
                               const ui::LocatedEvent& event) override;
   void PointerDraggedOnButton(views::View* view,
                               Pointer pointer,
                               const ui::LocatedEvent& event) override;
   void PointerReleasedOnButton(views::View* view,
                                Pointer pointer,
@@ skipping 177 matching lines @@
 
   // Tracks UMA metrics based on shelf button press actions.
   ShelfButtonPressedMetricTracker shelf_button_pressed_metric_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_VIEW_H_