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These tests were disabled for flakiness many years ago.
They passed 3000 iterations on the bots without failures.

Bug: 68287, 128412
Change-Id: I4196dbd345aebbacbe3d378fd76a21990234b930
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404406Reviewed-by: Kelvin Jiang <kelvinjiang@chromium.org>
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807605}