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It's not clear to me that removeProperty as currently defined does the right thing for shorthands, because it's talking about declarations but there is no declaration for the shorthand so much; it's expanded out into its subproperties.
https://dvcs.w3.org/hg/csswg/rev/0529dc78d281 Still need to fix getPropertyValue and setProperty to be clearer.
https://dvcs.w3.org/hg/csswg/rev/29e1b40f9bb1 https://dvcs.w3.org/hg/csswg/rev/a45add1017ef