Ship the ancestor restriction to 'first-party'.

Ship the ancestor restriction to 'first-party'.

https://www.chromestatus.com/features/5592111340584960

Intent to Ship: https://groups.google.com/a/chromium.org/d/msg/blink-dev/ZvMEJMSU6po/KDnS4ES9L8kJ

BUG=477578
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=195523

[Mike West, 2015-05-18 08:10:54]

mkwst@chromium.org changed reviewers:
+ jochen@chromium.org

[Mike West, 2015-05-18 08:10:55]

WDYT, Jochen? I'm hoping I can just carry over the M44 ItS LGTMs now that I've
fixed the bug that caused the revert.

[jochen (gone - plz use gerrit), 2015-05-18 22:49:10]

lgtm

[Mike West, 2015-05-19 09:12:42]

The CQ bit was checked by mkwst@chromium.org

[Mike West, 2015-05-19 09:12:42]

The patchset sent to the CQ was uploaded after l-g-t-m from jochen@chromium.org
Link to the patchset: https://codereview.chromium.org/1141303002/#ps20001
(title: "Fix.")

[commit-bot: I haz the power, 2015-05-19 09:12:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1141303002/20001

[commit-bot: I haz the power, 2015-05-19 10:34:53]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=195523