Remove legacy SkMesh functions

Client CLs:
 - http://ag/24151403
 - http://cl/549704569

Change-Id: Ib94475992a4f6fb7323f92053c62542812777b9d
Bug: skia:14317
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/728701
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
2 files changed