Remove the CSSOM.

sky/engine/core/css/StylePropertySet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. 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 480 matching lines @@
             list.append(CSSProperty(properties[i], value.release(), false));
     }
     return MutableStylePropertySet::create(list.data(), list.size());
 }
 
 CSSStyleDeclaration* MutableStylePropertySet::ensureCSSStyleDeclaration()
 {
     // FIXME: get rid of this weirdness of a CSSStyleDeclaration inside of a
     // style property set.
     if (m_cssomWrapper) {
-        ASSERT(!static_cast<CSSStyleDeclaration*>(m_cssomWrapper.get())->parentRule());
         ASSERT(!m_cssomWrapper->parentElement());
         return m_cssomWrapper.get();
     }
     m_cssomWrapper = adoptPtr(new PropertySetCSSStyleDeclaration(*this));
     return m_cssomWrapper.get();
 }
 
 int MutableStylePropertySet::findPropertyIndex(CSSPropertyID propertyID) const
 {
     // Convert here propertyID into an uint16_t to compare it with the metadata's m_propertyID to avoid
@@ skipping 52 matching lines @@
     result.appendLiteral(": ");
     result.append(propertyValue()->cssText());
     if (isImportant())
         result.appendLiteral(" !important");
     result.append(';');
     return result.toString();
 }
 
 
 } // namespace blink