Re: [heycam/webidl] Remove [LegacyArrayClass] (#291)

@zcorpan all `[LegacyArrayClass]` does is that it puts `Array.prototype` on the prototype chain. It is unrelated to `item()`.

https://drafts.csswg.org/cssom/ says `MediaList`, `StyleSheetList`, and `CSSRuleList` use it.

`w("map" in document.styleSheets)` returns false in every browser I tried it in...

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