Fix CSSStyleValue.parse() / parseAll() for shorthand CSS properties.
Pull request: https://github.com/WebKit/WebKit/pull/5917
Committed 256228@main (fd2b5bf98a6e): <https://commits.webkit.org/256228@main> Reviewed commits have been landed. Closing PR #5917 and removing active labels.
<rdar://problem/101860919>