Don't skip the style sharing cache if an element is affected by state.
Don't skip the style sharing cache if an element is affected by state.

All elements end up with AFFECTED_BY_STATE right now, presumably due to the UA
sheet, and some non-TS pseudo-classes we've added, which means that we currently
never insert anything into the cache.

MozReview-Commit-ID: 5IU4qrjeJFy

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