Revert "Add support for gray + colorspace to SkCodec"

This reverts commit 8491dd80c89943cc535427aa1521edd6de1fb64f.

Reason for revert: BonusConfigs bot asserting on some color images.

Original change's description:
> Add support for gray + colorspace to SkCodec
> 
> In both PNG and JPEG, support passing Gray8 directly to skcms, and
> remove assertions about gray never having a color xform.
> 
> Remove SkImage_Lazy hacks to strip color spaces when decoding gray.
> 
> Change-Id: I64c7b480c51a2b0c839e7eb8ed3a5fdea5aa4e41
> Reviewed-on: https://skia-review.googlesource.com/150909
> Reviewed-by: Mike Klein <mtklein@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>

TBR=mtklein@google.com,scroggo@google.com,brianosman@google.com

Change-Id: Iebdd4f60144380d4ef462225ff3cadb7b91eee84
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/150912
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
5 files changed