Move the requestID argument before the result

This tries to get the order of declaration to be consistent.
It also follows the order used by Chromium in some places
where the routing_id usually comes first, then the request_id
and then the result of the asynchronous request.

Change-Id: I88e164dee67e1631161a222f7dd7a4679c3d3acd
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>