Revert of DM: add a pixel check to serialize (patchset #4 id:60001 of https://coderev...

Revert of DM: add a pixel check to serialize (patchset #4 id:60001 of https://codereview.chromium.org/1561993003/ )

Reason for revert:
breaks windows bots; additional windows specific failures need to be blacklisted

Original issue's description:
> DM: add a pixel check to serialize
>
> If we're running through serialize and then drawing into some raster target (e.g. serialize-8888 like we run on the bots), make sure the serialized version is identical to what we'd get if we just drew into the rest of the pipeline (i.e. 8888).
>
> Start by blacklisting all current failures.  This at least prevents further regression.
>
> BUG=skia:4095
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1561993003
>
> Committed: https://skia.googlesource.com/skia/+/6eb4e36a93ea695e7adb771ea9ac3326680a8e98

TBR=reed@google.com,mtklein@google.com,mtklein@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4095

Review URL: https://codereview.chromium.org/1563923003