Replace more ObserverList with base::ObserverList.

content/browser/notification_service_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_NOTIFICATION_SERVICE_IMPL_H_
 #define CONTENT_BROWSER_NOTIFICATION_SERVICE_IMPL_H_
 
 #include <map>
 
 #include "base/observer_list.h"
@@ skipping 15 matching lines @@
   ~NotificationServiceImpl() override;
 
   // NotificationService:
   void Notify(int type,
               const NotificationSource& source,
               const NotificationDetails& details) override;
 
  private:
   friend class NotificationRegistrar;
 
-  typedef ObserverList<NotificationObserver> NotificationObserverList;
+  typedef base::ObserverList<NotificationObserver> NotificationObserverList;
   typedef std::map<uintptr_t, NotificationObserverList*> NotificationSourceMap;
   typedef std::map<int, NotificationSourceMap> NotificationObserverMap;
   typedef std::map<int, int> NotificationObserverCount;
 
   // Convenience function to determine whether a source has a
   // NotificationObserverList in the given map;
   static bool HasKey(const NotificationSourceMap& map,
                      const NotificationSource& source);
 
   // NOTE: Rather than using this directly, you should use a
@@ skipping 39 matching lines @@
   // balanced.
   NotificationObserverCount observer_counts_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(NotificationServiceImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_NOTIFICATION_SERVICE_IMPL_H_