and drop unused constant StreamProperties

Change-Id: I6a358cf7914412231d6c8f926a0d2fbd4bb8009b
Reviewed-on: https://gerrit.libreoffice.org/33885Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>