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Some devices may be domain joined but not have any active policies.
We should also disable DoH by default for that scenario.

Bug: 955454
Change-Id: I50ad015e9e5d072dddcaa72524e5d39ffb2e005c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773397Reviewed-by: Eric Orth <ericorth@chromium.org>
Commit-Queue: Katharine Daly <dalyk@google.com>
Cr-Commit-Position: refs/heads/master@{#690809}