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The CertVerifier implementations are moving out of the network
service and into the CertVerifierService for sandboxing reasons.

Creators of NetworkContexts need to provide a pipe to a
CertVerifierService in the NetworkContextParams. This CL does that
for some remaining ChromeOS unittests.

The CertVerifierService also requires an IO thread on ChromeOS,
so some unittests switch to using BrowserTaskEnvironment instead
of the other various test::TaskEnvironments.

Bug: 1015134, 1094483
Change-Id: I3fb3097492b3d3a9de7572fbabddd5a041580a0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2515203Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823789}