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This test was disabled due to being flaky long time ago, especially on
MacOS 10.6. It seems working fine on newer versions of Mac. So we
re-enable it.

BUG=84299

Change-Id: I1aca1edb36d6942e0ee4c7e0230e7bc76d874556
Reviewed-on: https://chromium-review.googlesource.com/c/1347276Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611506}