Remove Attr.isId and Attr.ownerElement.

Remove Attr.isId and Attr.ownerElement.

These properties were removed in DOM4
<http://dom.spec.whatwg.org/#interface-attr>;. Use counters
AttributeIsId and AttributeOwnerElement indicate they're rarely used
on the web (<0.01%.)

BUG=305105
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=164820

[dominicc (has gone to gerrit), 2014-01-05 01:11:27]

PTAL

Use counters report 0.00% for these, so I'm removing them without an Intent to
Remove.

I'm not sure if deleting/editing the tests in dom/xhtml is right, or whether
adding expectations is better. WDYT?

I'm seeing SO much cruft that can be cleaned up in core/dom. But going to send
bite-sized CLs.

[eseidel, 2014-01-06 15:00:43]

I would still send an Intent to Deprecate and Remove, since removing things from
the web platform is still such a rare event.

In any case, assuming your numbers are from at least the beta channel (and
ideally the stable channel) LGTM.

[commit-bot: I haz the power, 2014-01-09 22:32:16]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dominicc@chromium.org/124643003/120001

[commit-bot: I haz the power, 2014-01-10 01:40:21]

Change committed as 164820