Remove resource type-specific fetching logic from ResourceFetcher

Source/core/svg/SVGFEImageElement.cpp

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2010 Dirk Schulze <krit@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.
  *
@@ skipping 65 matching lines @@
         m_cachedImage->removeClient(this);
         m_cachedImage = 0;
     }
 
     removeAllOutgoingReferences();
 }
 
 void SVGFEImageElement::fetchImageResource()
 {
     FetchRequest request(ResourceRequest(ownerDocument()->completeURL(hrefString())), localName());
-    m_cachedImage = document().fetcher()->fetchImage(request);
+    m_cachedImage = ImageResource::fetch(request, document().fetcher());
 
     if (m_cachedImage)
         m_cachedImage->addClient(this);
 }
 
 void SVGFEImageElement::buildPendingResource()
 {
     clearResourceReferences();
     if (!inDocument())
         return;
@@ skipping 61 matching lines @@
 }
 
 PassRefPtrWillBeRawPtr<FilterEffect> SVGFEImageElement::build(SVGFilterBuilder*, Filter* filter)
 {
     if (m_cachedImage)
         return FEImage::createWithImage(filter, m_cachedImage->imageForLayoutObject(layoutObject()), m_preserveAspectRatio->currentValue());
     return FEImage::createWithIRIReference(filter, treeScope(), hrefString(), m_preserveAspectRatio->currentValue());
 }
 
 }