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In SECURE or AUTOMATIC mode, we should be able to send secure DoH queries via
the async resolver regardless of whether the async resolver is enabled for
sending insecure queries.

The network service will be updated in a follow-up cl to actually set the
insecure and secure parts separately; for now support is just being added in
HostResolverManager.

Bug: 985589
Change-Id: Ife79f70897229aadc4f7111c3ce07de47b47a32b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1497654
Commit-Queue: Katharine Daly <dalyk@google.com>
Reviewed-by: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680069}