Remove last vestiges of samples

Bug: skia:13870
Change-Id: I88e30c84eccdabbc1e2630f21d345c063c473672
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/613079
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Herb Derby <herb@google.com>
16 files changed