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

Source/core/svg/SVGMPathElement.cpp

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 46 matching lines @@
     clearResourceReferences();
 }
 
 void SVGMPathElement::buildPendingResource()
 {
     clearResourceReferences();
     if (!inDocument())
         return;
 
     String id;
-    Element* target = SVGURIReference::targetElementFromIRIString(hrefCurrentValue(), document(), &id);
+    Element* target = SVGURIReference::targetElementFromIRIString(hrefCurrentValue(), &document(), &id);
     if (!target) {
         // Do not register as pending if we are already pending this resource.
-        if (document()->accessSVGExtensions()->isElementPendingResource(this, id))
+        if (document().accessSVGExtensions()->isElementPendingResource(this, id))
             return;
 
         if (!id.isEmpty()) {
-            document()->accessSVGExtensions()->addPendingResource(id, this);
+            document().accessSVGExtensions()->addPendingResource(id, this);
             ASSERT(hasPendingResources());
         }
     } else if (target->isSVGElement()) {
         // Register us with the target in the dependencies map. Any change of hrefElement
         // that leads to relayout/repainting now informs us, so we can react to it.
-        document()->accessSVGExtensions()->addElementReferencingTarget(this, toSVGElement(target));
+        document().accessSVGExtensions()->addElementReferencingTarget(this, toSVGElement(target));
     }
 
     targetPathChanged();
 }
 
 void SVGMPathElement::clearResourceReferences()
 {
-    ASSERT(document());
-    document()->accessSVGExtensions()->removeAllTargetReferencesForElement(this);
+    document().accessSVGExtensions()->removeAllTargetReferencesForElement(this);
 }
 
 Node::InsertionNotificationRequest SVGMPathElement::insertedInto(ContainerNode* rootParent)
 {
     SVGElement::insertedInto(rootParent);
     if (rootParent->inDocument())
         buildPendingResource();
     return InsertionDone;
 }
 
@@ skipping 45 matching lines @@
     }
 
     if (SVGExternalResourcesRequired::isKnownAttribute(attrName))
         return;
 
     ASSERT_NOT_REACHED();
 }
 
 SVGPathElement* SVGMPathElement::pathElement()
 {
-    Element* target = targetElementFromIRIString(hrefCurrentValue(), document());
+    Element* target = targetElementFromIRIString(hrefCurrentValue(), &document());
     if (target && target->hasTagName(SVGNames::pathTag))
         return toSVGPathElement(target);
     return 0;
 }
 
 void SVGMPathElement::targetPathChanged()
 {
     notifyParentOfPathChange(parentNode());
 }
 
 void SVGMPathElement::notifyParentOfPathChange(ContainerNode* parent)
 {
     if (parent && parent->hasTagName(SVGNames::animateMotionTag))
         static_cast<SVGAnimateMotionElement*>(parent)->updateAnimationPath();
 }
 
 } // namespace WebCore