remove SkUnpremultiplyRow()

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I2b5fff033ae132334aa9ffcc312b330de81fb3d5
Reviewed-on: https://skia-review.googlesource.com/c/167920
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
5 files changed