Clear StyleResolverState after each resolve.

Source/core/css/resolver/StyleResolverState.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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 51 matching lines @@
 public:
     void initForStyleResolve(Document*, Element*, RenderStyle* parentStyle = 0, RenderRegion* regionForStyling = 0);
     void clear();
 
     Document* document() const { return m_element->document(); }
     Element* element() const { return m_element; }
     Element* styledElement() const { return m_styledElement; }
     void setStyle(PassRefPtr<RenderStyle> style) { m_style = style; }
     RenderStyle* style() const { return m_style.get(); }
     PassRefPtr<RenderStyle> takeStyle() { return m_style.release(); }
+    PassRefPtr<RenderStyle> takeStyleAndClear();
 
     const ContainerNode* parentNode() const { return m_parentNode; }
     void setParentStyle(PassRefPtr<RenderStyle> parentStyle) { m_parentStyle = parentStyle; }
     RenderStyle* parentStyle() const { return m_parentStyle.get(); }
     RenderStyle* rootElementStyle() const { return m_rootElementStyle; }
 
     const RenderRegion* regionForStyling() const { return m_regionForStyling; }
     EInsideLink elementLinkState() const { return m_elementLinkState; }
     bool distributedToInsertionPoint() const { return m_distributedToInsertionPoint; }
     void setElementAffectedByClassRules(bool isAffected) { m_elementAffectedByClassRules = isAffected; }
@@ skipping 86 matching lines @@
     CachedUAStyle m_cachedUAStyle;
     ElementStyleResources m_elementStyleResources;
     // CSSToStyleMap is a pure-logic class and only contains
     // a back-pointer to this object.
     CSSToStyleMap m_styleMap;
 };
 
 } // namespace WebCore
 
 #endif // StyleResolverState_h