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TimeClamper is only used by Performance, so there is no need
to put it as low as platform/.

Change-Id: I531be082528f2e569bbff08a5ace42076d9bb845
Reviewed-on: https://chromium-review.googlesource.com/1157174Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584583}