To address the API review feedback provided by
the API council.
Bug: 129261432
Test: atest DnsResolverTest
Merged-In: I5737cf293264bf9d492e7bd56b62bee4d49002eb
(cherry picked from commit dca57c2e44)
Change-Id: I429dd93285f50314e9d757f4ec8539a3ba40e61b