Treat marker like a real shorthand for initial and inherit

Source/core/css/StylePropertyShorthandCustom.cpp

Index: Source/core/css/StylePropertyShorthandCustom.cpp
diff --git a/Source/core/css/StylePropertyShorthandCustom.cpp b/Source/core/css/StylePropertyShorthandCustom.cpp
index 8140b8a64edebf09685b64c4cf439fb859b9d81e..66c19c67ce1dc8baa10c6e11392bb7bfa0025b44 100644
--- a/Source/core/css/StylePropertyShorthandCustom.cpp
+++ b/Source/core/css/StylePropertyShorthandCustom.cpp
@@ -152,8 +152,7 @@ bool isExpandedShorthandForAll(CSSPropertyID propertyId)
     // And while applying "all" property, we cannot apply "font" property
     // directly. This causes ASSERT crash, because StyleBuilder assume that
     // all given properties are not expanded shorthands.
-    // "marker" has the same issue.
-    if (propertyId == CSSPropertyMarker || propertyId == CSSPropertyFont)
+    if (propertyId == CSSPropertyFont)
         return true;
     return shorthandForProperty(propertyId).length();
 }