Revert 132288 - Shrink immutable ElementAttributeData and StylePropertySet by one pointer each.

Source/WebCore/css/StylePropertySet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. 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 35 matching lines @@
 
 typedef HashMap<const StylePropertySet*, OwnPtr<PropertySetCSSStyleDeclaration> > PropertySetCSSOMWrapperMap;
 static PropertySetCSSOMWrapperMap& propertySetCSSOMWrapperMap()
 {
     DEFINE_STATIC_LOCAL(PropertySetCSSOMWrapperMap, propertySetCSSOMWrapperMapInstance, ());
     return propertySetCSSOMWrapperMapInstance;
 }
 
 static size_t immutableStylePropertySetSize(unsigned count)
 {
-    return sizeof(StylePropertySet) + sizeof(CSSProperty) * count;
+    return sizeof(ImmutableStylePropertySet) + sizeof(CSSProperty) * count;
 }
 
 PassRefPtr<StylePropertySet> StylePropertySet::createImmutable(const CSSProperty* properties, unsigned count, CSSParserMode cssParserMode)
 {
     void* slot = WTF::fastMalloc(immutableStylePropertySetSize(count));
     return adoptRef(new (slot) ImmutableStylePropertySet(properties, count, cssParserMode));
 }
 
 PassRefPtr<StylePropertySet> StylePropertySet::immutableCopyIfNeeded() const
 {
@@ skipping 1068 matching lines @@
 {
     return adoptRef(new MutableStylePropertySet(cssParserMode));
 }
 
 PassRefPtr<StylePropertySet> StylePropertySet::create(const CSSProperty* properties, unsigned count)
 {
     return adoptRef(new MutableStylePropertySet(properties, count));
 }
 
 } // namespace WebCore