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

Now blocked on https://github.com/tabatkins/bikeshed/issues/1066, but please regard this as a done deal.

```
DOMTokernList's toggle()/replace() cannot always update the attribute

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

Tests: https://github.com/w3c/web-platform-tests/issues/6764.

Fixes #451.
```

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