Revert of Disable storage.indexeddb_endure_tracing.reference perf test (patchset #1 id:1 of https://codereview.chromium.org/1355143002/ )
Revert of Disable storage.indexeddb_endure_tracing.reference perf test (patchset #1 id:1 of https://codereview.chromium.org/1355143002/ )

Reason for revert:
Ref build rolled in December (https://code.google.com/p/chromium/issues/detail?id=458538), trying to re-enable.

Original issue's description:
> Disable storage.indexeddb_endure_tracing.reference perf test
>
> The perf test is failing on the reference build turning the waterfall
> red.
>
> BUG=534409
>
> Committed: https://crrev.com/0a30f13172c1f8be4f0f6e462419c9287de733ab
> Cr-Commit-Position: refs/heads/master@{#349986}

TBR=sullivan@chromium.org,pmeenan@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=534409

Review URL: https://codereview.chromium.org/1640803004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#371929}

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