Remove more remnants of SkVertices bone support

Bug: skia:9984
Change-Id: Ib79cf2509f5f92672cbb0b6060b8b33f99e9ac28
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/281162
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Mike Reed <reed@google.com>
3 files changed