Revert of respect sRGB when converting from sk to gr configs (patchset #1 id:1 of https://codereview.chromium.org/1756913003/ )

Reason for revert:
Two major regressions from this change:
- Mac images may end up too bright, if they're correctly tagged as sRGB. That's a sub-set of a much larger issue where L32 mode needs to suppress sRGB -> Linear conversion of pretty much everything.
- Various low-end GPUs (Mali400 Android, iPad4) don't render in sRGB at all, causing tests to produce no output at all.

Original issue's description:
> respect sRGB when converting from sk to gr configs
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1756913003
>
> Committed: https://skia.googlesource.com/skia/+/c6663dc36b157e40c8225130f5970a346f9ba7c3

TBR=reed@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1759653005
1 file changed