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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=proberge@chromium.org

Change-Id: I05cc6ca56595f4cd8f9ba6887e5a3fa93a6927f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1649365
Auto-Submit: Carlos Caballero <carlscab@google.com>
Reviewed-by: proberge <proberge@chromium.org>
Commit-Queue: proberge <proberge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667183}