Remove unused ShelfModelObserver::ShelfStatusChanged()

ash/shelf/shelf_model.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_MODEL_H_
 #define ASH_SHELF_SHELF_MODEL_H_
 
 #include "ash/ash_export.h"
 #include "ash/shelf/shelf_item_types.h"
 #include "base/macros.h"
@@ skipping 56 matching lines @@
   // Returns a reserved id which will not be used by the |ShelfModel|.
   ShelfID reserve_external_id() { return next_id_++; }
 
   // Returns an iterator into items() for the item with the specified id, or
   // items().end() if there is no item with the specified id.
   ShelfItems::const_iterator ItemByID(ShelfID id) const;
 
   const ShelfItems& items() const { return items_; }
   int item_count() const { return static_cast<int>(items_.size()); }
 
-  void SetStatus(Status status);
+  void set_status(Status status) { status_ = status; }
   Status status() const { return status_; }
 
   void AddObserver(ShelfModelObserver* observer);
   void RemoveObserver(ShelfModelObserver* observer);
 
  private:
   // Makes sure |index| is in line with the type-based order of items. If that
   // is not the case, adjusts index by shifting it to the valid range and
   // returns the new value.
   int ValidateInsertionIndex(ShelfItemType type, int index) const;
 
   // ID assigned to the next item.
   ShelfID next_id_;
 
   ShelfItems items_;
   Status status_;
   base::ObserverList<ShelfModelObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfModel);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_MODEL_H_