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

Tho *just* using an Array subclass still leaves you with the question, raised by Boris, of what the result of calling `obj.map()` is; if this is grabbing the `Array.prototype.map` function, then your callback result isn't typechecked, and the method returns an ordinary Array.  (Same with `filter`, and any of the other Array methods that return an Array.)  Ideally you want the result to be an object of the same type.

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