Revert of Re-add suppressions for magnifier and dropshadow GMs. (patchset #1 id:1 of https://codereview.chromium.org/686573002/)

Reason for revert:
Trying to get revert of patchset potentially causing failures on image filter tests

Original issue's description:
> Re-add suppressions for magnifier and dropshadow GMs.
>
> Brian's change has invalidated the new baselines, so they'll need
> to be rebaselined again once his changed has worked its way through.
>
> TBR=bsalomon
> NOTRY=true
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/fa4689d56384da5bb264a480e636fac126fb93ca

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

Review URL: https://codereview.chromium.org/679413002
1 file changed