Make aria-relevant and ariaRelevant reflect

[sideshowbarker]

The ariaRelevant IDL attribute seems to have been intentionally commented out from the ARIAMixin interface in https://github.com/w3c/aria/commit/646f093848a1943c8343f34ad80f72dbd78f54e6 — without any explanation that I could find, including not in the related issue at https://github.com/w3c/aria/issues/1058.

But since at https://w3c.github.io/aria/#idl-reflection-attribute-values the spec says:

All ARIA attributes reflect in IDL as nullable DOMString attributes.

…and since there’s a test case included in http://wpt.live/html/dom/aria-attribute-reflection.html, and WebKit, Gecko, and Blink all pass that test — then it seems ariaRelevant needs to be included in ARIAMixin in the spec.

• [x] "author MUST" tests: N/A
• [x] "user agent MUST" tests: http://wpt.live/html/dom/aria-attribute-reflection.html
• [x] Browser implementations (link to issue or commit):
  • WebKit: Already implemented to reflect
  • Gecko: Already implemented to reflect
  • Blink: Already implemented to reflect
• [ ] Does this need AT implementations?
• [ ] Related APG Issue/PR:
• [ ] MDN Issue/PR:

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