[Gecko Bug 1741491] Make sure we only record old style value once. #31665
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The way CommitStyles called into servo caused it to call the closure
multiple times, and we were not dealing with that properly.
Handle the "was called" state internally.
Differential Revision: https://phabricator.services.mozilla.com/D131411
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1741491
gecko-commit: 00f24d1721eabfa3458ff50b4653ede395d64b70
gecko-reviewers: smaug