[NetworkChangeNotifier] Return more specific network connection types (ethernet/wifi) on OSX

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 9acb47c57971c4b423748a5763d9c252ebd9e4d2..34b1266a12f27511ebb3575608af0e61d9d38975 100644
--- a/net/base/network_change_notifier_mac.h
+++ b/net/base/network_change_notifier_mac.h
@@ -48,6 +48,9 @@ class NetworkChangeNotifierMac: public NetworkChangeNotifier {
  private:
   class DnsConfigServiceThread;
 
+  // Called on the main thread on startup, afterwards on the notifier thread.
+  static ConnectionType CalculateConnectionType(SCNetworkConnectionFlags flags);
+
   // Methods directly called by the NetworkConfigWatcherMac::Delegate:
   void StartReachabilityNotifications();
   void SetDynamicStoreNotificationKeys(SCDynamicStoreRef store);