Replace more ObserverList with base::ObserverList.

net/base/network_change_notifier.h

Index: net/base/network_change_notifier.h
diff --git a/net/base/network_change_notifier.h b/net/base/network_change_notifier.h
index b2e54f52321810b97e03bdcc2670a10fb35324dd..df6792f7dcfe6c172fe1a78a326a3a88308f8f16 100644
--- a/net/base/network_change_notifier.h
+++ b/net/base/network_change_notifier.h
@@ -430,15 +430,15 @@ class NET_EXPORT NetworkChangeNotifier {
   void NotifyObserversOfNetworkChangeImpl(ConnectionType type);
   void NotifyObserversOfMaxBandwidthChangeImpl(double max_bandwidth_mbps);
 
-  const scoped_refptr<ObserverListThreadSafe<IPAddressObserver>>
+  const scoped_refptr<base::ObserverListThreadSafe<IPAddressObserver>>
       ip_address_observer_list_;
-  const scoped_refptr<ObserverListThreadSafe<ConnectionTypeObserver>>
+  const scoped_refptr<base::ObserverListThreadSafe<ConnectionTypeObserver>>
       connection_type_observer_list_;
-  const scoped_refptr<ObserverListThreadSafe<DNSObserver>>
+  const scoped_refptr<base::ObserverListThreadSafe<DNSObserver>>
       resolver_state_observer_list_;
-  const scoped_refptr<ObserverListThreadSafe<NetworkChangeObserver>>
+  const scoped_refptr<base::ObserverListThreadSafe<NetworkChangeObserver>>
       network_change_observer_list_;
-  const scoped_refptr<ObserverListThreadSafe<MaxBandwidthObserver>>
+  const scoped_refptr<base::ObserverListThreadSafe<MaxBandwidthObserver>>
       max_bandwidth_observer_list_;
 
   // The current network state. Hosts DnsConfig, exposed via GetDnsConfig.