Move CSSOM classes to using MutableStylePropertySet over StylePropertySet.

Source/core/dom/Attr.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 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
@@ skipping 13 matching lines @@
 
 #ifndef Attr_h
 #define Attr_h
 
 #include "core/dom/ContainerNode.h"
 #include "core/dom/QualifiedName.h"
 
 namespace WebCore {
 
 class CSSStyleDeclaration;
-class StylePropertySet;
+class MutableStylePropertySet;
 
 // Attr can have Text children
 // therefore it has to be a fullblown Node. The plan
 // is to dynamically allocate a textchild and store the
 // resulting nodevalue in the attribute upon
 // destruction. however, this is not yet implemented.
 
 class Attr FINAL : public ContainerNode {
 public:
     static PassRefPtr<Attr> create(Element*, const QualifiedName&);
@@ skipping 44 matching lines @@
     virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0);
 
     Attribute& elementAttribute();
 
     // Attr wraps either an element/name, or a name/value pair (when it's a standalone Node.)
     // Note that m_name is always set, but m_element/m_standaloneValue may be null.
     Element* m_element;
     QualifiedName m_name;
     AtomicString m_standaloneValue;
 
-    RefPtr<StylePropertySet> m_style;
+    RefPtr<MutableStylePropertySet> m_style;
     unsigned m_ignoreChildrenChanged : 31;
     bool m_specified : 1;
 };
 
 } // namespace WebCore
 
 #endif // Attr_h