[whatwg/dom] NodeIterator's pre-removing steps need to account for node being root (#615)

Fixes #496.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/615

-- Commit Summary --

  * NodeIterator's pre-removing steps need to account for node being root

-- File Changes --

    M dom.bs (3)

-- Patch Links --

https://github.com/whatwg/dom/pull/615.patch
https://github.com/whatwg/dom/pull/615.diff

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