Make arguments to Element methods non-optional

Make arguments to Element methods non-optional

http://dom.spec.whatwg.org/#interface-element

Only touch methods defined by the above spec.

The added missing-arguments test passes in Firefox Nightly, and
Opera 12.16. IE11 Release Preview passes all except getAttribute,
removeAttribute and setAttribute, where it returns null/undefined
instead of throwing.

Taken together, this could break IE- and Chrome-only content.

BUG=325922
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=163374

[philipj_slow, 2013-12-06 21:13:52]

Probably depends on https://codereview.chromium.org/107093007/ to land first due
to conflicts.

[arv (Not doing code reviews), 2013-12-06 21:16:41]

LGTM

[commit-bot: I haz the power, 2013-12-07 07:11:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/98543009/1

[commit-bot: I haz the power, 2013-12-07 08:29:24]

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

[commit-bot: I haz the power, 2013-12-07 17:43:40]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/98543009/20001

[commit-bot: I haz the power, 2013-12-07 19:22:36]

Change committed as 163374