remove overrides of (dead) onDrawTextRSXform

Bug: skia:
Change-Id: Iebfe7bd322849e73a0e84c1b04ac0f4c922fb746
Reviewed-on: https://skia-review.googlesource.com/c/179561
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
26 files changed