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

Source/core/svg/SVGFontFaceElement.cpp

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2007, 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 298 matching lines @@
         RefPtr<CSSValue> src = m_fontFaceRule->properties()->getPropertyCSSValue(CSSPropertySrc);
         CSSValueList* srcList = toCSSValueList(src.get());
 
         unsigned srcLength = srcList ? srcList->length() : 0;
         for (unsigned i = 0; i < srcLength; i++) {
             if (CSSFontFaceSrcValue* item = static_cast<CSSFontFaceSrcValue*>(srcList->itemWithoutBoundsCheck(i)))
                 item->setSVGFontFaceElement(this);
         }
     }
 
-    document()->styleResolverChanged(RecalcStyleDeferred);
+    document().styleResolverChanged(RecalcStyleDeferred);
 }
 
 Node::InsertionNotificationRequest SVGFontFaceElement::insertedInto(ContainerNode* rootParent)
 {
     SVGElement::insertedInto(rootParent);
     if (!rootParent->inDocument()) {
         ASSERT(!m_fontElement);
         return InsertionDone;
     }
-    document()->accessSVGExtensions()->registerSVGFontFaceElement(this);
+    document().accessSVGExtensions()->registerSVGFontFaceElement(this);
 
     rebuildFontFace();
     return InsertionDone;
 }
 
 void SVGFontFaceElement::removedFrom(ContainerNode* rootParent)
 {
     SVGElement::removedFrom(rootParent);
 
     if (rootParent->inDocument()) {
         m_fontElement = 0;
-        document()->accessSVGExtensions()->unregisterSVGFontFaceElement(this);
+        document().accessSVGExtensions()->unregisterSVGFontFaceElement(this);
         m_fontFaceRule->mutableProperties()->clear();
 
-        document()->styleResolverChanged(RecalcStyleDeferred);
+        document().styleResolverChanged(RecalcStyleDeferred);
     } else
         ASSERT(!m_fontElement);
 }
 
 void SVGFontFaceElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
 {
     SVGElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
     rebuildFontFace();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG_FONTS)