Remove unused vertex filler

Change-Id: Ie46e1b4cfb76b672eef60a87ea8ca94106052a00
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/294296
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Herb Derby <herb@google.com>
4 files changed