Replace more ObserverList with base::ObserverList.

components/user_manager/user_manager_base.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_USER_MANAGER_USER_MANAGER_BASE_H_
 #define COMPONENTS_USER_MANAGER_USER_MANAGER_BASE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 378 matching lines @@
 
   // Cached flag indicating whether the ephemeral user policy is enabled.
   // Defaults to |false| if the value has not been read from trusted device
   // policy yet.
   bool ephemeral_users_enabled_;
 
   // Cached name of device owner. Defaults to empty string if the value has not
   // been read from trusted device policy yet.
   std::string owner_email_;
 
-  ObserverList<UserManager::Observer> observer_list_;
+  base::ObserverList<UserManager::Observer> observer_list_;
 
   // TODO(nkostylev): Merge with session state refactoring CL.
-  ObserverList<UserManager::UserSessionStateObserver>
+  base::ObserverList<UserManager::UserSessionStateObserver>
       session_state_observer_list_;
 
   // Time at which this object was created.
   base::TimeTicks manager_creation_time_;
 
   // ID of the user just added to the session that needs to be activated
   // as soon as user's profile is loaded.
   std::string pending_user_switch_;
 
   // ID of the user that was active in the previous session.
   // Preference value is stored here before first user signs in
   // because pref will be overidden once session restore starts.
   std::string last_session_active_user_;
   bool last_session_active_user_initialized_;
 
   // TaskRunner for UI thread.
   scoped_refptr<base::TaskRunner> task_runner_;
 
   // TaskRunner for SequencedWorkerPool.
   scoped_refptr<base::TaskRunner> blocking_task_runner_;
 
   base::WeakPtrFactory<UserManagerBase> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(UserManagerBase);
 };
 
 }  // namespace user_manager
 
 #endif  // COMPONENTS_USER_MANAGER_USER_MANAGER_BASE_H_