Make CSSSupportsRule function arguments non-optional

Make CSSSupportsRule function arguments non-optional

http://dev.w3.org/csswg/css-conditional/#the-csssupportsrule-interface
http://dev.w3.org/csswg/css-conditional/#the-cssconditionrule-interface
http://dev.w3.org/csswg/css-conditional/#the-cssgroupingrule-interface

Per spec CSSSupportsRule and CSSMediaRule inherits from CSSConditionRule
which inherits from CSSGroupingRule, which is where insertRule() and
deleteRule() live. We expose neither CSSConditionRule nor
CSSGroupingRule, but this change aligns CSSSupportsRule with
CSSMediaRule, so that introducing CSSGroupingRule becomes a smaller
change.

Firefox Nightly already throws exceptions when insertRule() or
deleteRule() arguments are omitted. IE11 does not support @supports.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=187121

[philipj_slow, 2014-12-12 11:54:37]

philipj@opera.com changed reviewers:
+ timloh@chromium.org

[Timothy Loh, 2014-12-14 23:19:46]

On 2014/12/12 11:54:38, philipj wrote:

lgtm

[philipj_slow, 2014-12-15 06:46:35]

The CQ bit was checked by philipj@opera.com

[commit-bot: I haz the power, 2014-12-15 06:47:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/797013002/1

[commit-bot: I haz the power, 2014-12-15 08:49:53]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=187121