[whatwg/dom] adoptNode() needs to account for <iframe> and friends (Issue #1428)

annevk created an issue (whatwg/dom#1428)

### What is the issue with the DOM Standard?

In particular, if you run `adoptNode()` on an `iframe` with the `iframe`'s nested document as this, all browsers throw.

I don't think we can really use the "adopting steps" for this as they run too late and it also seems like it's specific to `adoptNode()` and not adopt in general. I'm not entirely sure why it happens as the `iframe` element could certainly be removed and all would be fine I think, but that's just not the reality.

https://software.hixie.ch/utilities/js/live-dom-viewer/?%3C!DOCTYPE%20html%3E%0A%3Ciframe%3E%3C%2Fiframe%3E%0A%3Cscript%3E%0Aself%5B0%5D.document.adoptNode(self%5B0%5D.frameElement)%3B%0A%3C%2Fscript%3E

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