Re: [w3c/IndexedDB] DOMStringList has been removed from DOM (#28)

Yeah, as @sicking has said in the past I think `FrozenArrayWithContains<>` and `FrozenArrayWithItem<>` which are real array subclasses are the least-bad path forward here. Again, based on previous discussion, I think we need one implementation to "prove" this approach is web-compatible then we can push these into WebIDL/specs.

I don't know what that entails implementation-wise in Blink, and I haven't thought at all about what other questions this raises (is the subclass's constructor exposed on the global? is `instance.constructor` callable w/o throwing by user script? etc)

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