Re: [webidl] All supported property names should be enumerable or none of them (#82)

@bzbarsky Maybe that's just my limited knowledge of idlharness.js, but I don't know how to share a test between multiple interfaces in an easy way there. Just testing the unenumerability of named properties of interfaces with `[LegacyUnenumerable]` sounds more straightforward to me.

I just realised while writing this that it doesn't need to be in the spec to be tested this way, but it still sounds nicer to me to formalise the meaning of that attribute here.

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