Expand system font values during font property parsing

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 b157746c8b99736ec302206f380d2deb93dc3e79..39385aaa4e9c1684b10275baccd956fbf2080b0e 100644
--- a/Source/core/css/StylePropertyShorthandCustom.cpp
+++ b/Source/core/css/StylePropertyShorthandCustom.cpp
@@ -103,13 +103,6 @@ const StylePropertyShorthand& parsingShorthandForProperty(CSSPropertyID property
 
 bool isExpandedShorthand(CSSPropertyID id)
 {
-    // The system fonts bypass the normal style resolution by using RenderTheme,
-    // thus we need to special case it here. FIXME: This is a violation of CSS 3 Fonts
-    // as we should still be able to change the longhands.
-    // DON'T ADD ANY SHORTHAND HERE UNLESS IT ISN'T ALWAYS EXPANDED AT PARSE TIME (which is wrong).
-    if (id == CSSPropertyFont)
-        return false;
-
     return shorthandForProperty(id).length();
 }