Replace more ObserverList with base::ObserverList.

components/view_manager/animation_runner.h

 // Copyright 2014 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 COMPONENTS_VIEW_MANAGER_ANIMATION_RUNNER_H_
 #define COMPONENTS_VIEW_MANAGER_ANIMATION_RUNNER_H_
 
 #include <algorithm>
 #include <map>
 #include <set>
@@ skipping 82 matching lines @@
 
   // Removes |view| from both |view_to_animation_map_| and |id_to_views_map_|.
   // Returns true if there are no more views animating with the animation id
   // the view is associated with.
   bool RemoveViewFromMaps(ServerView* view);
 
   AnimationId next_id_;
 
   base::TimeTicks last_tick_time_;
 
-  ObserverList<AnimationRunnerObserver> observers_;
+  base::ObserverList<AnimationRunnerObserver> observers_;
 
   ViewToAnimationMap view_to_animation_map_;
 
   IdToViewsMap id_to_views_map_;
 
   DISALLOW_COPY_AND_ASSIGN(AnimationRunner);
 };
 
 }  // namespace view_manager
 
 #endif  // COMPONENTS_VIEW_MANAGER_ANIMATION_RUNNER_H_