Replace more ObserverList with base::ObserverList.

ash/test/test_shell_delegate.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_TEST_TEST_SHELL_DELEGATE_H_
 #define ASH_TEST_TEST_SHELL_DELEGATE_H_
 
 #include <string>
 
 #include "ash/media_delegate.h"
@@ skipping 58 matching lines @@
   };
 
  private:
   int num_exit_requests_;
   bool multi_profiles_enabled_;
   bool force_maximize_on_first_run_;
 
   scoped_ptr<content::BrowserContext> active_browser_context_;
   scoped_ptr<app_list::AppListViewDelegate> app_list_view_delegate_;
 
-  ObserverList<ash::VirtualKeyboardStateObserver> keyboard_state_observer_list_;
+  base::ObserverList<ash::VirtualKeyboardStateObserver>
+      keyboard_state_observer_list_;
 
   TestSessionStateDelegate* test_session_state_delegate_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(TestShellDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SHELL_DELEGATE_H_