remove read/write rawpixels

Bug: skia:
Change-Id: I000b70414119355fef0d45de4ae9ef996b8a5568
Reviewed-on: https://skia-review.googlesource.com/77903
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
4 files changed