Re: [webcomponents] Change registries to be per document and never shared between documents (#369)

I think I still favor a slightly different model:

1. Registry is per realm
2. Documents by default don't use the registry
3. Documents with a browsing context use the registry

That would also mean we keep the registry when you navigate an initial about:blank which I think is what we want. The `document.open()` semantics would also fall out more naturally.

I guess I can live with the current model, but this seems more logical.

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