Reduce CSSProperty's StylePropertyMetadata memory footprint by half when used inside a ImmutableSty…

Source/core/css/StylePropertySet.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2012 Apple Inc. 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 39 matching lines @@
 
     class PropertyReference {
     public:
         PropertyReference(const StylePropertySet& propertySet, unsigned index)
             : m_propertySet(propertySet)
             , m_index(index)
         {
         }
 
         CSSPropertyID id() const { return static_cast<CSSPropertyID>(propertyMetadata().m_propertyID); }
-        CSSPropertyID shorthandID() const { return static_cast<CSSPropertyID>(propertyMetadata().m_shorthandID); }
+        CSSPropertyID shorthandID() const { return propertyMetadata().shorthandID(); }
 
         bool isImportant() const { return propertyMetadata().m_important; }
         bool isInherited() const { return propertyMetadata().m_inherited; }
         bool isImplicit() const { return propertyMetadata().m_implicit; }
 
         String cssName() const;
         String cssText() const;
 
         const CSSValue* value() const { return propertyValue(); }
         // FIXME: We should try to remove this mutable overload.
@@ skipping 188 matching lines @@
 
     if (m_isMutable)
         delete static_cast<MutableStylePropertySet*>(this);
     else
         delete static_cast<ImmutableStylePropertySet*>(this);
 }
 
 } // namespace WebCore
 
 #endif // StylePropertySet_h