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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=kmackay@chromium.org

Change-Id: I1ac52d598e71f6569f544c0cdaee67c07ffd7f1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648269
Auto-Submit: Carlos Caballero <carlscab@google.com>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Carlos Caballero <carlscab@google.com>
Cr-Commit-Position: refs/heads/master@{#669598}