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

I thought I had raised this before but I cannot find it. I don't see a reason to keep this prototype-changing thingy around. Interfaces that need it should be able to use `iterable<>` instead and since it's relatively new it seems unlikely this is fully interoperable anyway.

On IRC someone mentioned CSSOM uses this. @zcorpan, do you think that usage can be replaced with `iterable<>`?

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