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This test caused a recent good change to be reverted because the
flakiness tilted more towards "constant failure" on Mac 10.13 (see
https://chromium-review.googlesource.com/c/chromium/src/+/1509365).

According to the Flake Portal (and running the test on a clean checkout
on my local Linux and Mac machines), the test indeed is flaky.

TBR=chcunningham@chromium.org

Bug: 931533
Change-Id: I368b171a69ce423e47810c77ab0346bc8286c7cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1509633Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638751}