Remove Q-only code in DnsResolver
This CL removes code paths that only runs on Q and older, which is no longer supported. Test: Treehugger Merged-In: Ia29e0b9a1b1ad2a17eaed2ab94a4f07825fcd065 Change-Id: Ia29e0b9a1b1ad2a17eaed2ab94a4f07825fcd065
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