Revert of Reduce window rectangles cap to 8 (patchset #1 id:1 of https://codereview...

Revert of Reduce window rectangles cap to 8 (patchset #1 id:1 of https://codereview.chromium.org/2254013002/ )

Reason for revert:
Breaking Ubuntu

Original issue's description:
> Reduce window rectangles cap to 8
>
> Lowers the cap to 8 and adds a warning message if this value is ever
> exceeded. The largest (only) implementation currently supports 8, so
> there isn't yet reason to go higher.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2254013002
>
> Committed: https://skia.googlesource.com/skia/+/52d721580ee22525c285e2d13cf3975a7a1b2843

TBR=mjk@nvidia.com,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/2253293003