Remove lazy image color space hacks for gray

Change-Id: Idca6c0bb237d7973f84acbd2f0583cc8b6c6292c
Reviewed-on: https://skia-review.googlesource.com/150241
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2 files changed