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Looking at the flakiness dashboard, all of the failures are due to
timers running within 200ms of the expected time. The test is intended
to detect the difference between timers running at 100ms intervals and
at 1000ms intervals, so the greater tolerance still provides adequate
coverage.

BUG=971590
R=alexclarke@chromium.org

Change-Id: I7b9ea31ad6dce2ba3c2cbfb9f3afa0eb8ea29ff3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758662Reviewed-by: Alex Clarke <alexclarke@chromium.org>
Commit-Queue: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688509}