[whatwg/dom] DOMTokernList's toggle() cannot always update the attribute (#452)

The consistency change made in d396872f847d63b803393092eb81843e80d566b7
turned out to not be compatible with the web.

Fixes #451.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/452

-- Commit Summary --

  * DOMTokernList's toggle() cannot always update the attribute

-- File Changes --

    M dom.bs (16)

-- Patch Links --

https://github.com/whatwg/dom/pull/452.patch
https://github.com/whatwg/dom/pull/452.diff

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