createListener() is never overriden

Change-Id: I95c095eb7a6f315019fb851fb20e65314eaebf55
Reviewed-on: https://gerrit.libreoffice.org/13091
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>