Replace more ObserverList with base::ObserverList.

components/signin/core/browser/account_tracker_service.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_SIGNIN_CORE_BROWSER_ACCOUNT_TRACKER_SERVICE_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_ACCOUNT_TRACKER_SERVICE_H_
 
 #include <list>
 #include <map>
 #include <string>
@@ skipping 173 matching lines @@
   // Virtual so that tests can override the network fetching behaviour.
   virtual void SendRefreshTokenAnnotationRequest(const std::string& account_id);
   void RefreshTokenAnnotationRequestDone(const std::string& account_id);
 
   void ScheduleNextRefreshFromTokenService();
 
   OAuth2TokenService* token_service_;  // Not owned.
   SigninClient* signin_client_;  // Not owned.
   std::map<std::string, AccountInfoFetcher*> user_info_requests_;
   std::map<std::string, AccountState> accounts_;
-  ObserverList<Observer> observer_list_;
+  base::ObserverList<Observer> observer_list_;
   bool shutdown_called_;
   bool network_fetches_enabled_;
   std::list<std::string> pending_user_info_fetches_;
   base::Time last_updated_;
   base::OneShotTimer<AccountTrackerService> timer_;
 
   // Holds references to refresh token annotation requests keyed by account_id.
   base::ScopedPtrHashMap<std::string, scoped_ptr<RefreshTokenAnnotationRequest>>
       refresh_token_annotation_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(AccountTrackerService);
 };
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_ACCOUNT_TRACKER_SERVICE_H_