Revert of Suppression for valgrind bug (patchset #1 id:1 of https://codereview.chromi...

Revert of Suppression for valgrind bug (patchset #1 id:1 of https://codereview.chromium.org/1410953002/ )

Reason for revert:
We believe this was suppressing an out of date error that was being triggered because the valgrind bot was not rebuilding nanobench. The valgrind bot has been fixed (is there a bug tracking that?), so this suppression is probably not necessary.

Original issue's description:
> Suppression for valgrind bug
>
> TBR=msarett@google.com
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> BUG=skia:4478
>
> Committed: https://skia.googlesource.com/skia/+/82e341ff8764ef6168a0c9322089c391d657ae7f

TBR=msarett@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4478

Review URL: https://codereview.chromium.org/1406333006