Revert node.contains to the original behavior.

Revert node.contains to the original behavior.

The node.contains changed the behavior in
https://chromiumcodereview.appspot.com/21123005

We don't have any spec for that.
Until we have a wider consensus, it should be better to revert the change.
It is not wise to leave this change as is because it doesn't follow the semantics of node.contains defined in DOM living standard.

http://dom.spec.whatwg.org/#dom-node-contains

This is discussed on this W3 bug:
<https://www.w3.org/Bugs/Public/show_bug.cgi?id=22141>;

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=169296

[esprehn, 2014-03-15 02:13:08]

Since we have ShadowRoot.host now you can implement your own tree traversal and
answer the question "Am I in this document" more easily now so I'm okay
reverting this. I had pushed for it before since it was important to allow
asking that question, and we didn't have ShadowRoot.host yet.

lgtm

[esprehn, 2014-03-15 02:21:21]

The CQ bit was checked by esprehn@chromium.org

[commit-bot: I haz the power, 2014-03-15 02:21:30]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hayato@chromium.org/197283016/1

[commit-bot: I haz the power, 2014-03-15 02:21:41]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-03-15 02:21:42]

Try jobs failed on following builders:
  tryserver.blink on blink_presubmit

[esprehn, 2014-03-15 02:21:52]

The CQ bit was checked by esprehn@chromium.org

[commit-bot: I haz the power, 2014-03-15 02:22:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hayato@chromium.org/197283016/1

[commit-bot: I haz the power, 2014-03-15 03:03:26]

Change committed as 169296