Revert of stop dropping AA when rect stays rect (patchset #8 id:140001 of https://codereview.chromium.org/1295523002/ )

Reason for revert:
breaks layout tests

Original issue's description:
> stop dropping AA when rect stays rect
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/1bef9f59c566cc54c2259cc4d0171c115157cd1c

TBR=bsalomon@google.com,robertphillips@google.com,joshualitt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1295813005
1 file changed