Replace more ObserverList with base::ObserverList.

ui/views/focus/focus_manager.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 UI_VIEWS_FOCUS_FOCUS_MANAGER_H_
 #define UI_VIEWS_FOCUS_FOCUS_MANAGER_H_
 
 #include <list>
 #include <map>
 
@@ skipping 353 matching lines @@
   bool shortcut_handling_suspended_;
 
   // The storage id used in the ViewStorage to store/restore the view that last
   // had focus.
   int stored_focused_view_storage_id_;
 
   // The reason why the focus most recently changed.
   FocusChangeReason focus_change_reason_;
 
   // The list of registered FocusChange listeners.
-  ObserverList<FocusChangeListener, true> focus_change_listeners_;
+  base::ObserverList<FocusChangeListener, true> focus_change_listeners_;
 
   // See description above getter.
   bool is_changing_focus_;
 
   DISALLOW_COPY_AND_ASSIGN(FocusManager);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_FOCUS_FOCUS_MANAGER_H_