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MessageLoopForUI will go away, eventually.

ScopedTaskEnvironment will per default start a ThreadPool, which should
be fine in most of the cases. If you believe 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=msw@chromium.org

Change-Id: I682631b97e8a874f9d586520a937929d91953e44
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1718025Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Carlos Caballero <carlscab@google.com>
Cr-Commit-Position: refs/heads/master@{#685561}