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This makes oilpan benchmarks no longer run on perf waterfall. However,
these benchmarks are still runnable locally & on try bot.

Bug: 717320
Change-Id: I4eb52a6a8306a03879c808821f25238dfc5bb49e
Reviewed-on: https://chromium-review.googlesource.com/492806Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#468594}