[whatwg/dom] TreeWalker’s relationship to Document? (#818)

TreeWalker instances can only be created with `Document.prototype.createTreeWalker`. Is this by necessity, due to some relationship created between a given Document and TreeWalker up front, or is this just historical? I didn’t see anything obvious in the spec that suggested TreeWalkers maintain a relationship to the Document from which they were created — it doesn’t even appear the Node argument has to have the same ownerDocument.

Asking mainly because it would be lovely to be able to just write `new TreeWalker`.



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