Start calculating new combined NetworkChangeNotifier signal

net/base/network_change_notifier_mac.h

Index: net/base/network_change_notifier_mac.h
diff --git a/net/base/network_change_notifier_mac.h b/net/base/network_change_notifier_mac.h
index 9a9e6bf0b67d4374ecfb7609b48551183e551fe8..ad9429ac4fd9161ded6cafabc7d19bd6c1766d39 100644
--- a/net/base/network_change_notifier_mac.h
+++ b/net/base/network_change_notifier_mac.h
@@ -59,6 +59,8 @@ class NetworkChangeNotifierMac: public NetworkChangeNotifier {
                                    SCNetworkConnectionFlags flags,
                                    void* notifier);
 
+  static NetworkChangeCalculatorParams NetworkChangeCalculatorParamsMac();
+
   // These must be constructed before config_watcher_ to ensure
   // the lock is in a valid state when Forwarder::Init is called.
   ConnectionType connection_type_;