Replace more ObserverList with base::ObserverList.

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 354 matching lines @@
 
   // Used for the context menu of a particular item.
   ShelfID context_menu_id_;
 
   scoped_ptr<views::FocusSearch> focus_search_;
 
   scoped_ptr<ui::MenuModel> context_menu_model_;
 
   scoped_ptr<views::MenuRunner> launcher_menu_runner_;
 
-  ObserverList<ShelfIconObserver> observers_;
+  base::ObserverList<ShelfIconObserver> observers_;
 
   // Amount content is inset on the left edge (or top edge for vertical
   // alignment).
   int leading_inset_;
 
   ShelfGestureHandler gesture_handler_;
 
   // True when an item being inserted or removed in the model cancels a drag.
   bool cancelling_drag_model_changed_;
 
@@ skipping 64 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_