Have SVGURIReference API deal with Document references, not pointers

Source/core/rendering/svg/SVGRenderTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 2009 Apple Inc. All rights reserved.
  *           (C) 2005 Rob Buis <buis@kde.org>
  *           (C) 2006 Alexander Kellett <lypanov@kde.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 620 matching lines @@
 
 void writeResources(TextStream& ts, const RenderObject& object, int indent)
 {
     const RenderStyle* style = object.style();
     const SVGRenderStyle* svgStyle = style->svgStyle();
 
     // FIXME: We want to use SVGResourcesCache to determine which resources are present, instead of quering the resource <-> id cache.
     // For now leave the DRT output as is, but later on we should change this so cycles are properly ignored in the DRT output.
     RenderObject& renderer = const_cast<RenderObject&>(object);
     if (!svgStyle->maskerResource().isEmpty()) {
-        if (RenderSVGResourceMasker* masker = getRenderSVGResourceById<RenderSVGResourceMasker>(&object.document(), svgStyle->maskerResource())) {
+        if (RenderSVGResourceMasker* masker = getRenderSVGResourceById<RenderSVGResourceMasker>(object.document(), svgStyle->maskerResource())) {
             writeIndent(ts, indent);
             ts << " ";
             writeNameAndQuotedValue(ts, "masker", svgStyle->maskerResource());
             ts << " ";
             writeStandardPrefix(ts, *masker, 0);
             ts << " " << masker->resourceBoundingBox(&renderer) << "\n";
         }
     }
     if (!svgStyle->clipperResource().isEmpty()) {
-        if (RenderSVGResourceClipper* clipper = getRenderSVGResourceById<RenderSVGResourceClipper>(&object.document(), svgStyle->clipperResource())) {
+        if (RenderSVGResourceClipper* clipper = getRenderSVGResourceById<RenderSVGResourceClipper>(object.document(), svgStyle->clipperResource())) {
             writeIndent(ts, indent);
             ts << " ";
             writeNameAndQuotedValue(ts, "clipPath", svgStyle->clipperResource());
             ts << " ";
             writeStandardPrefix(ts, *clipper, 0);
             ts << " " << clipper->resourceBoundingBox(&renderer) << "\n";
         }
     }
     if (!svgStyle->filterResource().isEmpty()) {
-        if (RenderSVGResourceFilter* filter = getRenderSVGResourceById<RenderSVGResourceFilter>(&object.document(), svgStyle->filterResource())) {
+        if (RenderSVGResourceFilter* filter = getRenderSVGResourceById<RenderSVGResourceFilter>(object.document(), svgStyle->filterResource())) {
             writeIndent(ts, indent);
             ts << " ";
             writeNameAndQuotedValue(ts, "filter", svgStyle->filterResource());
             ts << " ";
             writeStandardPrefix(ts, *filter, 0);
             ts << " " << filter->resourceBoundingBox(&renderer) << "\n";
         }
     }
 }
 
 } // namespace WebCore