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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
/net.

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

This CL was uploaded by git cl split.

Edit: Reverted unintended changes to
      http_network_transaction_unittest.cc

R=mattm@chromium.org

Bug: 891670
Change-Id: Id402d28fb6411eab633d6697da771e5f7baab079
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786849
Commit-Queue: Matt Mueller <mattm@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Auto-Submit: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694795}