Replace more ObserverList with base::ObserverList.

net/cert/cert_database_ios.cc

 // 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.
 
 #include "net/cert/cert_database.h"
 
 #include "base/logging.h"
 #include "base/observer_list_threadsafe.h"
 #include "net/base/net_errors.h"
 
 namespace net {
 
 CertDatabase::CertDatabase()
-    : observer_list_(new ObserverListThreadSafe<Observer>) {}
+    : observer_list_(new base::ObserverListThreadSafe<Observer>) {
+}
 
 CertDatabase::~CertDatabase() {}
 
 int CertDatabase::CheckUserCert(X509Certificate* cert_obj) {
   // iOS doesn't handle user certificates.
   NOTREACHED();
   return OK;
 }
 
 int CertDatabase::AddUserCert(X509Certificate* cert_obj) {
   // iOS doesn't handle user certificates.
   NOTREACHED();
   return OK;
 }
 
 }  // namespace net