Remove unused ShelfModelObserver::ShelfStatusChanged()

ash/shelf/shelf_item_delegate_manager.cc

 // 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.
 
 #include "ash/shelf/shelf_item_delegate_manager.h"
 
 #include "ash/shelf/shelf_item_delegate.h"
 #include "ash/shelf/shelf_model.h"
 #include "ash/shell.h"
 #include "base/logging.h"
@@ skipping 40 matching lines @@
 
 ShelfItemDelegate* ShelfItemDelegateManager::GetShelfItemDelegate(ShelfID id) {
   if (model_->ItemIndexByID(id) != -1) {
     // Each ShelfItem has to have a ShelfItemDelegate.
     DCHECK(id_to_item_delegate_map_.find(id) != id_to_item_delegate_map_.end());
     return id_to_item_delegate_map_[id];
   }
   return NULL;
 }
 
-void ShelfItemDelegateManager::ShelfItemAdded(int index) {
-}
+void ShelfItemDelegateManager::ShelfItemAdded(int index) {}
 
 void ShelfItemDelegateManager::ShelfItemRemoved(int index, ShelfID id) {
   RemoveShelfItemDelegate(id);
   FOR_EACH_OBSERVER(ShelfItemDelegateManagerObserver,
                     observers_,
                     OnSetShelfItemDelegate(id, nullptr));
 }
 
 void ShelfItemDelegateManager::ShelfItemMoved(int start_index,
-                                              int target_index) {
-}
+                                              int target_index) {}
 
 void ShelfItemDelegateManager::ShelfItemChanged(int index,
-                                                const ShelfItem& old_item) {
-}
-
-void ShelfItemDelegateManager::ShelfStatusChanged() {
-}
+                                                const ShelfItem& old_item) {}
 
 void ShelfItemDelegateManager::RemoveShelfItemDelegate(ShelfID id) {
   if (id_to_item_delegate_map_.find(id) != id_to_item_delegate_map_.end()) {
     delete id_to_item_delegate_map_[id];
     id_to_item_delegate_map_.erase(id);
   }
 }
 
 }  // namespace ash