[NetworkChangeNotifier] Get connection type from interface list for Windows

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 a758cc3acf30c0400368d81280248e5971d0d8e7..66789794c0535c8456e74a016f9858d48aae8937 100644
--- a/net/base/network_change_notifier.h
+++ b/net/base/network_change_notifier.h
@@ -538,6 +538,10 @@ class NET_EXPORT NetworkChangeNotifier {
   // observers.
   static void SetInitialDnsConfig(const DnsConfig& config);
 
+  // Infer connection type from |GetNetworkList|. If all network interfaces
+  // have the same type, return it, otherwise return CONNECTION_UNKNOWN.
+  static ConnectionType ConnectionTypeFromInterfaces();
+
  private:
   friend class HostResolverImplDnsTest;
   friend class NetworkChangeNotifierAndroidTest;