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These tests were previously migrated from single-threaded MessageLoop to
a multi-threaded TaskEnvironment (then named ScopedTaskEnvironment) as
part of crbug.com/891670.

//base OWNERS decided in retrospect that it was better to keep a
single-threaded option for TaskEnvironment and introduced
SingleThreadTaskEnvironment. This CL retrofits that decision for
/base/fuchsia.

This CL is a no-op if it passes CQ.

This CL was uploaded by git cl split.

TBR=jamesr@chromium.org

Bug: 891670
Change-Id: I4a96de0332e48cde0453e04ec7552e2708a4f8f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787068Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Gabriel Charette <gab@chromium.org>
Auto-Submit: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694586}