Revert of Blacklist GLInstancedArraysBench on the ipad (patchset #1 id:1 of https://codereview.chromium.org/1529973002/ )

Reason for revert:
Whoops, this is for nanobench

Original issue's description:
> Blacklist GLInstancedArraysBench on the ipad
>
> BUG=skia:4714
>
> Committed: https://skia.googlesource.com/skia/+/5d16fea9e22221be5fbe2866bbcfe8d6f4c6aeac

TBR=jvanverth@google.com,joshualitt@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:4714

Review URL: https://codereview.chromium.org/1534513002
1 file changed