Expand system font values during font property parsing

Source/core/css/StylePropertyShorthandCustom.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 85 matching lines @@
         return borderShorthandForParsing();
     case CSSPropertyWebkitAnimation:
         return webkitAnimationShorthandForParsing();
     default:
         return shorthandForProperty(propertyID);
     }
 }
 
 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();
 }
 
 unsigned indexOfShorthandForLonghand(CSSPropertyID shorthandID, const Vector<StylePropertyShorthand, 4>& shorthands)
 {
     for (unsigned i = 0; i < shorthands.size(); ++i) {
         if (shorthands.at(i).id() == shorthandID)
             return i;
     }
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 } // namespace WebCore