This CL clean up patch in SVGElements.

Source/core/svg/graphics/filters/SVGFEImage.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2010 Dirk Schulze <krit@webkit.org>
  * Copyright (C) 2013 Google 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
@@ skipping 114 matching lines @@
     }
 
     destRect.intersect(requestedRect);
     addAbsolutePaintRect(destRect);
     return destRect;
 }
 
 LayoutObject* FEImage::referencedLayoutObject() const
 {
     if (!m_treeScope)
-        return 0;
+        return nullptr;
     Element* hrefElement = SVGURIReference::targetElementFromIRIString(m_href, *m_treeScope);
     if (!hrefElement || !hrefElement->isSVGElement())
-        return 0;
+        return nullptr;
     return hrefElement->layoutObject();
 }
 
 TextStream& FEImage::externalRepresentation(TextStream& ts, int indent) const
 {
     IntSize imageSize;
     if (m_image)
         imageSize = m_image->size();
     else if (LayoutObject* layoutObject = referencedLayoutObject())
         imageSize = enclosingIntRect(getLayoutObjectRepaintRect(layoutObject)).size();
@@ skipping 55 matching lines @@
     m_preserveAspectRatio->transformRect(dstRect, srcRect);
 
     SkBitmap bitmap;
     if (!m_image->bitmapForCurrentFrame(&bitmap))
         return adoptRef(SkBitmapSource::Create(SkBitmap()));
 
     return adoptRef(SkBitmapSource::Create(bitmap, srcRect, dstRect));
 }
 
 } // namespace blink