Auto merge of #14844 - emilio:to-css-simplification, r=SimonSapin
Auto merge of #14844 - emilio:to-css-simplification, r=SimonSapin

style: Simplify Debug impl for PropertyDeclaration reusing to_css.

These two functions appear in the data from bug 1328497, and the second part of one is identical to the other.

I think the way to fix this is another one (either using static arrays to get
the interesting data, or making rust generate the equivalent code).

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