remove unused SkBitmapProcState fields

None of these are used.

Change-Id: Ia8c0eb88db747da55fd03ff1632820a521ed1842
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/249817
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
2 files changed