Have StyleResolver / StyleResolverState deal with Document references, not pointers

Source/core/css/CSSToStyleMap.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 40 matching lines @@
     return m_state.rootElementStyle();
 }
 
 bool CSSToStyleMap::useSVGZoomRules() const
 {
     return m_state.useSVGZoomRules();
 }
 
 PassRefPtr<StyleImage> CSSToStyleMap::styleImage(CSSPropertyID propertyId, CSSValue* value)
 {
-    return m_elementStyleResources.styleImage(m_state.document()->textLinkColors(), propertyId, value);
+    return m_elementStyleResources.styleImage(m_state.document().textLinkColors(), propertyId, value);
 }
 
 void CSSToStyleMap::mapFillAttachment(CSSPropertyID, FillLayer* layer, CSSValue* value) const
 {
     if (value->isInitialValue()) {
         layer->setAttachment(FillLayer::initialFillAttachment(layer->type()));
         return;
     }
 
     if (!value->isPrimitiveValue())
@@ skipping 610 matching lines @@
         verticalRule = SpaceImageRule;
         break;
     default: // CSSValueRepeat
         verticalRule = RepeatImageRule;
         break;
     }
     image.setVerticalRule(verticalRule);
 }
 
 };