Cleanup SkGlyphRunPainter

Change-Id: I226285fd5629f816a97277a3642c7ce1823ed851
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/571046
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2 files changed