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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Fixes Gecko bug 1324619.
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Fixes Gecko bug 1376073. r=emilio
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::first-line, ::first-letter, and ::placeholder don't allow all properties to apply to them.
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I messed up when turning the conditions the other way around in #16981.
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