remove unused functions from glyph run classes

Change-Id: I7f49789a9409a2edad496fef2e80e2884e160f91
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/390478
Commit-Queue: Herb Derby <herb@google.com>
Auto-Submit: Herb Derby <herb@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed