Replace more ObserverList with base::ObserverList.

ash/wm/lock_state_controller.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_WM_LOCK_STATE_CONTROLLER_H_
 #define ASH_WM_LOCK_STATE_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/shell_observer.h"
 #include "ash/wm/lock_state_observer.h"
@@ skipping 265 matching lines @@
 
   // Fades out background layer with |speed| if it was hidden in unlocked state.
   void AnimateBackgroundHidingIfNecessary(
       ash::SessionStateAnimator::AnimationSpeed speed,
       SessionStateAnimator::AnimationSequence* animation_sequence);
 
   scoped_ptr<SessionStateAnimator> animator_;
 
   scoped_ptr<LockStateControllerDelegate> delegate_;
 
-  ObserverList<LockStateObserver> observers_;
+  base::ObserverList<LockStateObserver> observers_;
 
   // The current login status, or original login status from before we locked.
   user::LoginStatus login_status_;
 
   // Current lock status.
   bool system_is_locked_;
 
   // Are we in the process of shutting the machine down?
   bool shutting_down_;
 
@@ skipping 30 matching lines @@
   base::Closure lock_screen_displayed_callback_;
 
   base::WeakPtrFactory<LockStateController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LockStateController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_LOCK_STATE_CONTROLLER_H_