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This does not appear to be used by anything. When it was added in 2011,
there was some musing about using it but it seems it never was
(https://codereview.chromium.org/7518028/diff/12006/net/dns/dns_config_service_posix.cc#newcode52).

Bug: 831665
Change-Id: I1181594cb9f84ba406228075834c4fbfed42a21a
Reviewed-on: https://chromium-review.googlesource.com/1007664Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Rob Percival <robpercival@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550571}