Move CSSOM classes to using MutableStylePropertySet over StylePropertySet.

Source/core/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 503 matching lines @@
 }
 
 PropertySetCSSStyleDeclaration* StylePropertySet::cssStyleDeclaration()
 {
     if (!m_ownsCSSOMWrapper)
         return 0;
     ASSERT(isMutable());
     return propertySetCSSOMWrapperMap().get(this);
 }
 
-CSSStyleDeclaration* StylePropertySet::ensureCSSStyleDeclaration()
+CSSStyleDeclaration* MutableStylePropertySet::ensureCSSStyleDeclaration()
 {
-    ASSERT(isMutable());
-
     if (m_ownsCSSOMWrapper) {
         ASSERT(!static_cast<CSSStyleDeclaration*>(propertySetCSSOMWrapperMap().get(this))->parentRule());
         ASSERT(!propertySetCSSOMWrapperMap().get(this)->parentElement());
         return propertySetCSSOMWrapperMap().get(this);
     }
     m_ownsCSSOMWrapper = true;
-    PropertySetCSSStyleDeclaration* cssomWrapper = new PropertySetCSSStyleDeclaration(const_cast<StylePropertySet*>(this));
+    PropertySetCSSStyleDeclaration* cssomWrapper = new PropertySetCSSStyleDeclaration(this);
     propertySetCSSOMWrapperMap().add(this, adoptPtr(cssomWrapper));
     return cssomWrapper;
 }
 
-CSSStyleDeclaration* StylePropertySet::ensureInlineCSSStyleDeclaration(const StyledElement* parentElement)
+CSSStyleDeclaration* MutableStylePropertySet::ensureInlineCSSStyleDeclaration(const StyledElement* parentElement)
 {
-    ASSERT(isMutable());
-
     if (m_ownsCSSOMWrapper) {
         ASSERT(propertySetCSSOMWrapperMap().get(this)->parentElement() == parentElement);
         return propertySetCSSOMWrapperMap().get(this);
     }
     m_ownsCSSOMWrapper = true;
-    PropertySetCSSStyleDeclaration* cssomWrapper = new InlineCSSStyleDeclaration(const_cast<StylePropertySet*>(this), const_cast<StyledElement*>(parentElement));
+    PropertySetCSSStyleDeclaration* cssomWrapper = new InlineCSSStyleDeclaration(this, const_cast<StyledElement*>(parentElement));
     propertySetCSSOMWrapperMap().add(this, adoptPtr(cssomWrapper));
     return cssomWrapper;
 }
 
 unsigned StylePropertySet::averageSizeInBytes()
 {
     // Please update this if the storage scheme changes so that this longer reflects the actual size.
     return sizeForImmutableStylePropertySetWithPropertyCount(4);
 }
 
@@ skipping 50 matching lines @@
     result.appendLiteral(": ");
     result.append(propertyValue()->cssText());
     if (isImportant())
         result.appendLiteral(" !important");
     result.append(';');
     return result.toString();
 }
 
 
 } // namespace WebCore