clean up leftovers from 3d samples

Change-Id: Ifb2414932d43ea3fafe7226dccb4acafdc41a07d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/272337
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed