Don't use url from ImageResource for computed style.

third_party/WebKit/Source/core/style/StyleFetchedImage.cpp

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 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 38 matching lines @@
 
 WrappedImagePtr StyleFetchedImage::data() const {
   return m_image.get();
 }
 
 ImageResource* StyleFetchedImage::cachedImage() const {
   return m_image.get();
 }
 
 CSSValue* StyleFetchedImage::cssValue() const {
-  return CSSImageValue::create(m_image->url(),
-                               const_cast<StyleFetchedImage*>(this));
+  return CSSImageValue::create(m_url, const_cast<StyleFetchedImage*>(this));
 }
 
 CSSValue* StyleFetchedImage::computedCSSValue() const {
   return cssValue();
 }
 
 bool StyleFetchedImage::canRender() const {
   return !m_image->errorOccurred() && !m_image->getImage()->isNull();
 }
 
@@ skipping 65 matching lines @@
 }
 
 DEFINE_TRACE(StyleFetchedImage) {
   visitor->trace(m_image);
   visitor->trace(m_document);
   StyleImage::trace(visitor);
   ResourceClient::trace(visitor);
 }
 
 }  // namespace blink