[whatwg/dom] Always update a DOMTokenList (#444)

In particular when invoking toggle() and replace(). Also rewrite it in
terms of the Infra Standard.

Fixes #442 and fixes #443.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/444

-- Commit Summary --

  * Always update a DOMTokenList

-- File Changes --

    M dom.bs (71)

-- Patch Links --

https://github.com/whatwg/dom/pull/444.patch
https://github.com/whatwg/dom/pull/444.diff

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