remove paint::glyphsToUnichars

Bug: skia:
Change-Id: I3f97a74f6d0a9da2711a50740d83d2181858bda8
Reviewed-on: https://skia-review.googlesource.com/c/184301
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
3 files changed