Re-add "ip_address" field to Mac MDNS response fields.

Re-add "ip_address" field to Mac MDNS response fields.

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

Committed: https://crrev.com/34957445f6f2bf3c8de2f087d4038bf05e27a030
Cr-Commit-Position: refs/heads/master@{#361187}

[Vitaly Buka (NO REVIEWS), 2015-11-23 20:41:40]

The CQ bit was checked by vitalybuka@chromium.org

[Vitaly Buka (NO REVIEWS), 2015-11-23 20:41:41]

lgtm

[commit-bot: I haz the power, 2015-11-23 20:42:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1467393002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1467393002/1

[commit-bot: I haz the power, 2015-11-23 21:27:32]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-23 21:28:14]

Patchset 1 (id:??) landed as
https://crrev.com/34957445f6f2bf3c8de2f087d4038bf05e27a030
Cr-Commit-Position: refs/heads/master@{#361187}