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Reject hostnames that resolve to non-public exception unless a raw IP
address or a *.local hostname is entered by the user.

TODO: Show connection dialog and use the hostname provided by the user.

Below documents are from Eric Willigers <ericwilligers@chromium.org>.
Explainer: https://github.com/WICG/raw-sockets/blob/master/docs/explainer.md

Design doc:
https://docs.google.com/document/d/1Xa5nFkIWxkL3hZHvDYWPhT8sZvNeFpCUKNuqIwZHxnE/edit?usp=sharing

Bug: 1119661
Change-Id: I9a1300adf8b4acef2fbc2f18c465f86bc11b3859
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2631664
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844655}