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MessageLoop will go away, eventually.

ScopedTaskEnvironment will per default start a ThreadPool, which should
be fine in most of the cases. If you belive your test needs to make sure
that no ThreadPool runs let me know and I will update the patch.

BUG=891670
This CL was uploaded by git cl split.

R=liberato@chromium.org

Change-Id: Ie344bc13910dac814dc6ba8ecf8f0d7e63075540
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1635822
Auto-Submit: Carlos Caballero <carlscab@google.com>
Reviewed-by: Frank Liberato <liberato@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664786}