Those are leftovers; they're unused since
commit a23bd42e9b
Date: Tue Apr 6 14:26:06 2021 +0200
android: Drop custom file abstraction + UI
Change-Id: I898391cfccd465e4d18d51ee07ee847978872ef1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113885
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>