GitLab

cl/1436373002 removed this field from the response, which created
inconsistent behavior between service_discovery_client_impl.cc
and service_discovery_client_mac.mm.

Also added test expectations to catch the regression.

BUG=560448
R=vitalybuka@chromium.org
CC=wez@chromium.org

Review URL: https://codereview.chromium.org/1467393002

Cr-Commit-Position: refs/heads/master@{#361187}