Do not modify document in StyleResolverState

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 58 matching lines @@
     ContainerNode* m_parentNode;
     RenderStyle* m_rootElementStyle;
     EInsideLink m_elementLinkState;
     bool m_distributedToInsertionPoint;
     bool m_resetStyleInheritance;
 };
 
 // Initializes a StyleResolverState within a scope.
 class StyleResolveScope {
 public:
-    StyleResolveScope(StyleResolverState*, Document*, Element*, RenderStyle* parentStyle = 0, RenderRegion* regionForStyling = 0);
+    StyleResolveScope(StyleResolverState*, const Document*, Element*, RenderStyle* parentStyle = 0, RenderRegion* regionForStyling = 0);
     ~StyleResolveScope();
 private:
     StyleResolverState* m_state;
 };
 
 class StyleResolverState {
 WTF_MAKE_NONCOPYABLE(StyleResolverState);
 public:
     StyleResolverState()
     : m_regionForStyling(0)
@@ skipping 78 matching lines @@
     // Though all CSS values that can be applied to outermost <svg> elements (width/height/border/padding...)
     // need to respect the scaling. RenderBox (the parent class of RenderSVGRoot) grabs values like
     // width/height/border/padding/... from the RenderStyle -> for SVG these values would never scale,
     // if we'd pass a 1.0 zoom factor everyhwere. So we only pass a zoom factor of 1.0 for specific
     // properties that are NOT allowed to scale within a zoomed SVG document (letter/word-spacing/font-size).
     bool useSVGZoomRules() const { return element() && element()->isSVGElement(); }
 
 private:
     friend class StyleResolveScope;
 
-    void initForStyleResolve(Document*, Element*, RenderStyle* parentStyle = 0, RenderRegion* regionForStyling = 0);
+    void initForStyleResolve(const Document*, Element*, RenderStyle* parentStyle = 0, RenderRegion* regionForStyling = 0);
     void clear();
 
     void initElement(Element*);
 
     ElementResolveContext m_elementContext;
 
     // m_style is the primary output for each element's style resolve.
     RefPtr<RenderStyle> m_style;
 
     // m_parentStyle is not always just element->parentNode()->style()
@@ skipping 21 matching lines @@
 
     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