dns: remove unused Chromium bits

This was supposed to hook up to the bits Adam Langley did last year
for his local-dns-cache DBus service, but I misunderstood the
architecture.  It was a separate service, not Chromium itself.  But
it's unclear what happened to his local-dns-cache since the project
doesn't seem to have any commits in a year and I'm unsure if it's
actually being used.  So remove this stuff for now.

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