remove deprecated postTranslate255

Change-Id: Id2bdf73b5111c34f0ed1f36da85548a942568dcb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/211595
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Auto-Submit: Mike Reed <reed@google.com>
3 files changed