Remove unreachable labels for -webkit-margin-*-collapse properties.
<https://webkit.org/b/125057> The following properties are implemented in DeprecatedStyleBuilder and should not have case labels in the applyProperty() switch: -webkit-margin-before-collapse -webkit-margin-top-collapse -webkit-margin-after-collapse -webkit-margin-bottom-collapse This seems counter-intuitive, but they are actually *not* like other directional properties. In this case, before/after are only aliases for top/bottom, and do not depend on writing-mode or text-direction. See also r68561, where the aliases were originally added. Reviewed by Anders Carlsson. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@159911 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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