These classes are using a CSSPrimitiveValue wrapper for a Quad. They can just use the Quad directly.
Pull request: https://github.com/WebKit/WebKit/pull/6749
Committed 256968@main (bfb21d18f647): <https://commits.webkit.org/256968@main> Reviewed commits have been landed. Closing PR #6749 and removing active labels.
<rdar://problem/102623478>