The only reason why we had the `existing_style_for_style_damage` bit is to apply
some optimizations that we don't have anymore.
I still want to reintroduce a few of them, at least for the non-eager
pseudo-element case... But I think I won't need this at all.
This allows us to remove a fair amount of Gecko code too.
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Source-Repo: https://github.com/servo/servo
Source-Revision: 87206bd68ee6e870c10dc09d5a7b1f893805c379
99be60945a