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This change will allow URLRequests to bypass DoH during hostname
resolution.

Change-Id: Ic5a5346d57bf8fc639a82ff8b284f4e11893745d
Bug: 1012268
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842562
Commit-Queue: Katharine Daly <dalyk@google.com>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706093}