Replace more ObserverList with base::ObserverList.

net/proxy/polling_proxy_config_service.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/proxy/polling_proxy_config_service.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
@@ skipping 127 matching lines @@
     //               now chrome is constructing the ProxyConfigService on the
     //               UI thread so we can't cache the IO thread for the purpose
     //               of DCHECKs until the first call is made.
     if (!have_initialized_origin_runner_) {
       origin_task_runner_ = base::ThreadTaskRunnerHandle::Get();
       have_initialized_origin_runner_ = true;
     }
   }
 
   GetConfigFunction get_config_func_;
-  ObserverList<Observer> observers_;
+  base::ObserverList<Observer> observers_;
   ProxyConfig last_config_;
   base::TimeTicks last_poll_time_;
   base::TimeDelta poll_interval_;
 
   base::Lock lock_;
   scoped_refptr<base::SingleThreadTaskRunner> origin_task_runner_;
 
   bool have_initialized_origin_runner_;
   bool has_config_;
   bool poll_task_outstanding_;
@@ skipping 25 matching lines @@
 
 PollingProxyConfigService::~PollingProxyConfigService() {
   core_->Orphan();
 }
 
 void PollingProxyConfigService::CheckForChangesNow() {
   core_->CheckForChangesNow();
 }
 
 }  // namespace net