Remove Node.prefix so it's no longer visible to script.

Remove Node.prefix so it's no longer visible to script.

This is in line with DOM4 <http://dom.spec.whatwg.org/#node>;

prefix remains on Attr and Element, which is the only place it does
something useful, although setting prefixes will probably be removed
entirely.

BUG=325922
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=164729

[ojan, 2014-01-08 18:52:50]

lgtm

[commit-bot: I haz the power, 2014-01-08 18:53:03]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dominicc@chromium.org/126713004/1

[commit-bot: I haz the power, 2014-01-08 19:48:55]

Retried try job too often on mac_layout for step(s) webkit_lint
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_layout...

[commit-bot: I haz the power, 2014-01-09 00:12:22]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dominicc@chromium.org/126713004/210001

[commit-bot: I haz the power, 2014-01-09 02:41:03]

Change committed as 164729