[whatwg/dom] Editorial: remove parent argument to remove (#801)

A number of callers don't give it and callers do check for parent being non-null before calling. It seems we should assert it's non-null and then use that. I.e., turn the internal concept into being closer to `child.remove()` rather than `parent.removeChild(child)`.

Bonus: clean up attribute removal in a similar fashion.

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