Replace more ObserverList with base::ObserverList.

chromeos/cert_loader.h

 // Copyright (c) 2013 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 CHROMEOS_CERT_LOADER_H_
 #define CHROMEOS_CERT_LOADER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 90 matching lines @@
   // Called if a certificate load task is finished.
   void UpdateCertificates(scoped_ptr<net::CertificateList> cert_list);
 
   void NotifyCertificatesLoaded(bool initial_load);
 
   // net::CertDatabase::Observer
   void OnCACertChanged(const net::X509Certificate* cert) override;
   void OnCertAdded(const net::X509Certificate* cert) override;
   void OnCertRemoved(const net::X509Certificate* cert) override;
 
-  ObserverList<Observer> observers_;
+  base::ObserverList<Observer> observers_;
 
   // Flags describing current CertLoader state.
   bool certificates_loaded_;
   bool certificates_update_required_;
   bool certificates_update_running_;
 
   // The user-specific NSS certificate database from which the certificates
   // should be loaded.
   net::NSSCertDatabase* database_;
 
   // Cached Certificates loaded from the database.
   scoped_ptr<net::CertificateList> cert_list_;
 
   base::ThreadChecker thread_checker_;
 
   base::WeakPtrFactory<CertLoader> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CertLoader);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_CERT_LOADER_H_