Re: [WICG/webcomponents] Scoped Custom Element Registry: Moving elements with shadow roots between documents (#907)

Note that we already want registries to be settable so that script can add a registry to a declaratively created shadow root. With that the behavior of moving a shadow root to a new document can work similarly to declarative created shadow roots - the registry is set to an empty registry and can be replaced later by script, in this case probably in the `adoptedCallback`.

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