Revert of Fix caching of sample locations (patchset #3 id:40001 of https://codereview.chromium.org/2111423002/ )

Reason for revert:
Seems to be causing Chromium roll failures:
* https://codereview.chromium.org/2120373003
* https://codereview.chromium.org/2117193002
* https://codereview.chromium.org/2124653002

Original issue's description:
> Fix caching of sample locations
>
> The original caching logic for sample locations wishfully assumed that
> the GPU would always use the same sample pattern for render targets
> that had the same number of samples. It turns out we can't rely on
> that. This change improves the caching logic to handle mismatched
> simple patterns with the same count, and adds a unit test that
> emulates different sample patterns observed on real hardware.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2111423002
>
> Committed: https://skia.googlesource.com/skia/+/09d49a3bfe2d1e652a648ce1ea0962b38d10d166

TBR=bsalomon@google.com,csmartdalton@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/2120403002
11 files changed