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This error code will be used when a DoH server hostname cannot be
resolved due to a DNS issue.

Bug: 1016325
Change-Id: Icfe5ecd2d80c3182a540340adb7858b8a0c6f88a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906904Reviewed-by: Eric Orth <ericorth@chromium.org>
Commit-Queue: Katharine Daly <dalyk@google.com>
Cr-Commit-Position: refs/heads/master@{#714344}