Have Node::document() return a reference instead of a pointer

Source/core/css/CSSCursorImageValue.cpp

 /*
  * Copyright (C) 2006 Rob Buis <buis@kde.org>
  *           (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2008 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.
  *
@@ skipping 51 matching lines @@
     if (!isSVGCursor())
         return;
 
     HashSet<SVGElement*>::const_iterator it = m_referencedElements.begin();
     HashSet<SVGElement*>::const_iterator end = m_referencedElements.end();
     String url = toCSSImageValue(m_imageValue.get())->url();
 
     for (; it != end; ++it) {
         SVGElement* referencedElement = *it;
         referencedElement->cursorImageValueRemoved();
-        if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, referencedElement->document()))
+        if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, &referencedElement->document()))
             cursorElement->removeClient(referencedElement);
     }
 }
 
 String CSSCursorImageValue::customCssText() const
 {
     StringBuilder result;
     result.append(m_imageValue->cssText());
     if (m_hasHotSpot) {
         result.append(' ');
         result.appendNumber(m_hotSpot.x());
         result.append(' ');
         result.appendNumber(m_hotSpot.y());
     }
     return result.toString();
 }
 
 bool CSSCursorImageValue::updateIfSVGCursorIsUsed(Element* element)
 {
     if (!element || !element->isSVGElement())
         return false;
 
     if (!isSVGCursor())
         return false;
 
     String url = toCSSImageValue(m_imageValue.get())->url();
-    if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, element->document())) {
+    if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(url, &element->document())) {
         // FIXME: This will override hot spot specified in CSS, which is probably incorrect.
         SVGLengthContext lengthContext(0);
         m_hasHotSpot = true;
         float x = roundf(cursorElement->xCurrentValue().value(lengthContext));
         m_hotSpot.setX(static_cast<int>(x));
 
         float y = roundf(cursorElement->yCurrentValue().value(lengthContext));
         m_hotSpot.setY(static_cast<int>(y));
 
-        if (cachedImageURL() != element->document()->completeURL(cursorElement->hrefCurrentValue()))
+        if (cachedImageURL() != element->document().completeURL(cursorElement->hrefCurrentValue()))
             clearImageResource();
 
         SVGElement* svgElement = toSVGElement(element);
         m_referencedElements.add(svgElement);
         svgElement->setCursorImageValue(this);
         cursorElement->addClient(svgElement);
         return true;
     }
 
     return false;
@@ skipping 71 matching lines @@
     m_referencedElements.remove(element);
 }
 
 bool CSSCursorImageValue::equals(const CSSCursorImageValue& other) const
 {
     return m_hasHotSpot ? other.m_hasHotSpot && m_hotSpot == other.m_hotSpot : !other.m_hasHotSpot
         && compareCSSValuePtr(m_imageValue, other.m_imageValue);
 }
 
 } // namespace WebCore