[Gecko Bug 1545823] Implement non-standard CSSStyleSheet.rules, CSSStyleSheet.addRule and CSSStyleSheet.removeRule. #16876
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It's not worth dying on this hill. Both Blink and WebKit pass the tests.
(Well, WebKit actually fails one of the latest ones I wrote, cssRules and rules
are not the same JS object, WebKit returns a new rule list. I'll file)
Spec PR in w3c/csswg-drafts#3900.
Differential Revision: https://phabricator.services.mozilla.com/D30348
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1545823
gecko-commit: a93ed2a80220b9ba15fb9b59ea79b5f1ee8f7693
gecko-integration-branch: central
gecko-reviewers: bzbarsky