Revert "Fix flaky test for DnsResolverTest"

This reverts commit fb735de0e87b41a4bddf53043796ab2a01101466.

Reason for revert: This CL made whole test failed.

Bug: 153624005
Bug: 150952393
Bug: 151122313
Change-Id: I083529616dbf80421ea6a322bb57d2bb0f2bca62
3 files changed
tree: 5bee1c52e3df5420137e17ffcf6490018048f527
  1. tests/