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MessageLoopForIO will go away soon use ScopedTaskEnvironment instead.

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=nhiroki@chromium.org

Change-Id: I57789b7eb07a5d297bcaef61c979a113252acb40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1733615
Auto-Submit: Carlos Caballero <carlscab@google.com>
Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683901}