Remove the reply port form the native isolate handler

runtime/vm/native_message_handler.cc

Index: runtime/vm/native_message_handler.cc
diff --git a/runtime/vm/native_message_handler.cc b/runtime/vm/native_message_handler.cc
index 83bcf5e61c19dda938fe39d1dc5cf55c7d479e7d..7b3d9b91dd2bf2ccba6e5d17e3193c9b1a7b76d6 100644
--- a/runtime/vm/native_message_handler.cc
+++ b/runtime/vm/native_message_handler.cc
@@ -51,7 +51,7 @@ bool NativeMessageHandler::HandleMessage(Message* message) {
   ApiNativeScope scope;
   ApiMessageReader reader(message->data(), message->len(), zone_allocator);
   Dart_CObject* object = reader.ReadMessage();
-  (*func())(message->dest_port(), message->reply_port(), object);
+  (*func())(message->dest_port(), object);
   delete message;
   return true;
 }