There is zero chance an extension is using this, because it is so
intimately tired together with the oox and writerfilter interactions.
I'm removing this so I can expose the ShapeContextHandler and then
override it's implementation in a more fashion without jumping through
UNO hoops.
Change-Id: I79ef30247f4642303dfdb92bbf8f6e6226234829
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/117996
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
