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

1. How do you prevent them from being used there?
2. Who says they are window-less? You could be inserting them into an `<iframe>`.

But maybe we are saying the same, since I think that by default, custom elements should only instantiate automatically in documents with a browsing context. And for v1 we should not go beyond that. The other thing I'm saying is that I don't see a reason not to associate the registry with a global and put the API there (although maybe it should be stored on that global's document due to window.open() and such).

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