Avoid initial NetworkChangeNotifier OnDNSChanged() signal on Android

net/android/network_change_notifier_android.h

Index: net/android/network_change_notifier_android.h
diff --git a/net/android/network_change_notifier_android.h b/net/android/network_change_notifier_android.h
index f6d43d011298e7247d452a89ad63f497f71c6a3c..bb4669315976c88c159329da0b89b0481535c71a 100644
--- a/net/android/network_change_notifier_android.h
+++ b/net/android/network_change_notifier_android.h
@@ -13,6 +13,7 @@
 
 namespace net {
 
+struct DnsConfig;
 class NetworkChangeNotifierAndroidTest;
 class NetworkChangeNotifierFactoryAndroid;
 
@@ -66,8 +67,8 @@ class NET_EXPORT_PRIVATE NetworkChangeNotifierAndroid
 
   class DnsConfigServiceThread;
 
-  explicit NetworkChangeNotifierAndroid(
-      NetworkChangeNotifierDelegateAndroid* delegate);
+  NetworkChangeNotifierAndroid(NetworkChangeNotifierDelegateAndroid* delegate,
+                               const DnsConfig* dns_config_for_testing);
 
   static NetworkChangeCalculatorParams NetworkChangeCalculatorParamsAndroid();