Replace more ObserverList with base::ObserverList.

net/dns/mdns_client_impl.h

 // Copyright 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 NET_DNS_MDNS_CLIENT_IMPL_H_
 #define NET_DNS_MDNS_CLIENT_IMPL_H_
 
 #include <map>
 #include <queue>
 #include <string>
@@ skipping 123 matching lines @@
 
     // Parse the response and alert relevant listeners.
     void HandlePacket(DnsResponse* response, int bytes_read) override;
 
     void OnConnectionError(int error) override;
 
    private:
     FRIEND_TEST_ALL_PREFIXES(MDnsTest, CacheCleanupWithShortTTL);
 
     typedef std::pair<std::string, uint16> ListenerKey;
-    typedef std::map<ListenerKey, ObserverList<MDnsListenerImpl>* >
-    ListenerMap;
+    typedef std::map<ListenerKey, base::ObserverList<MDnsListenerImpl>*>
+        ListenerMap;
 
     // Alert listeners of an update to the cache.
     void AlertListeners(MDnsCache::UpdateType update_type,
                         const ListenerKey& key, const RecordParsed* record);
 
     // Schedule a cache cleanup to a specific time, cancelling other cleanups.
     void ScheduleCleanup(base::Time cleanup);
 
     // Clean up the cache and schedule a new cleanup.
     void DoCleanup();
@@ skipping 162 matching lines @@
   MDnsClientImpl* client_;
 
   bool started_;
   int flags_;
 
   DISALLOW_COPY_AND_ASSIGN(MDnsTransactionImpl);
 };
 
 }  // namespace net
 #endif  // NET_DNS_MDNS_CLIENT_IMPL_H_