Set proper referrer for css resource fetching

Source/core/css/CSSCursorImageValue.cpp

 /*
  * Copyright (C) 2006 Rob Buis <buis@kde.org>
  *           (C) 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 114 matching lines @@
         m_accessedImage = true;
 
         // For SVG images we need to lazily substitute in the correct URL. Rather than attempt
         // to change the URL of the CSSImageValue (which would then change behavior like cssText),
         // we create an alternate CSSImageValue to use.
         if (isSVGCursor() && loader && loader->document()) {
             RefPtrWillBeRawPtr<CSSImageValue> imageValue = toCSSImageValue(m_imageValue.get());
             // FIXME: This will fail if the <cursor> element is in a shadow DOM (bug 59827)
             if (SVGCursorElement* cursorElement = resourceReferencedByCursorElement(imageValue->url(), *loader->document())) {
                 RefPtrWillBeRawPtr<CSSImageValue> svgImageValue = CSSImageValue::create(loader->document()->completeURL(cursorElement->href()->currentValue()->value()));
+                svgImageValue->setReferrer(imageValue->referrer());
                 StyleFetchedImage* cachedImage = svgImageValue->cachedImage(loader);
                 m_image = cachedImage;
                 return cachedImage;
             }
         }
 
         if (m_imageValue->isImageValue())
             m_image = toCSSImageValue(m_imageValue.get())->cachedImage(loader);
     }
 
@@ skipping 47 matching lines @@
     return m_hasHotSpot ? other.m_hasHotSpot && m_hotSpot == other.m_hotSpot : !other.m_hasHotSpot
         && compareCSSValuePtr(m_imageValue, other.m_imageValue);
 }
 
 void CSSCursorImageValue::traceAfterDispatch(Visitor* visitor)
 {
     CSSValue::traceAfterDispatch(visitor);
 }
 
 } // namespace WebCore