NetworkChangeNotifierChromeos: Handle IPConfig property changes on the default network

chromeos/network/network_change_notifier_chromeos.h

Index: chromeos/network/network_change_notifier_chromeos.h
diff --git a/chromeos/network/network_change_notifier_chromeos.h b/chromeos/network/network_change_notifier_chromeos.h
index 6bd8edeb6e32742d77901b868e43414cc534b86a..6c163ef669edbe901737fb5573931a72a862f443 100644
--- a/chromeos/network/network_change_notifier_chromeos.h
+++ b/chromeos/network/network_change_notifier_chromeos.h
@@ -73,6 +73,8 @@ class CHROMEOS_EXPORT NetworkChangeNotifierChromeos
   NetworkChangeNotifier::ConnectionType connection_type_;
   // IP address for the current default network.
   std::string ip_address_;
+  // DNS servers for the current default network.
+  std::string dns_servers_;
   // Service path for the current default network.
   std::string service_path_;