[csswg-drafts] Pull Request: [cssom] editorial: Remove reference to non-existing flag.

emilio has just submitted a new pull request for https://github.com/w3c/csswg-drafts:

== [cssom] editorial: Remove reference to non-existing flag. ==
The fact that we haven't given-up loading the style sheet is enough,
there's no need for a specific flag. This is what...

  https://html.spec.whatwg.org/#contributes-a-script-blocking-style-sheet

... does as well.

Part of #6463

See https://github.com/w3c/csswg-drafts/pull/6490


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