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This CL exists to work around an issue where some users are being
configured with an outdated Finch config. It will ensure that we
cannot accidentally configure Chrome to use these old obsolete
versions. This CL includes an escape-hatch, it will be possible
to add the obsolete_versions_allowed flag in Finch in case we
want to intentionally enable obsolete versions for some future
reason. This CL also applies to cronet, though with the exception
that cronet currently allows Q043 as some cronet applications
currently rely on it.

R=renjietang@chromium.org

Change-Id: I275e1797c3cab1e0ddd411520e113cb957365896
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429868
Commit-Queue: David Schinazi <dschinazi@chromium.org>
Reviewed-by: Renjie Tang <renjietang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810543}