[ImageResource 4] Split ImageResource into Resource and Image parts

third_party/WebKit/Source/core/css/cssom/CSSStyleImageValue.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/cssom/CSSStyleImageValue.h"
 
 namespace blink {
 
 double CSSStyleImageValue::intrinsicWidth(bool& isNull) const {
   isNull = isCachePending();
@@ skipping 35 matching lines @@
 
 int CSSStyleImageValue::sourceWidth() {
   bool notUsed;
   return intrinsicWidth(notUsed);
 }
 
 PassRefPtr<Image> CSSStyleImageValue::image() const {
   if (isCachePending())
     return nullptr;
   // cachedImage can be null if image is StyleInvalidImage
-  ImageResource* cachedImage = m_imageValue->cachedImage()->cachedImage();
+  ImageResourceContent* cachedImage =
+      m_imageValue->cachedImage()->cachedImage();
   if (cachedImage) {
     // getImage() returns the nullImage() if the image is not available yet
     return cachedImage->getImage()->imageForDefaultFrame();
   }
   return nullptr;
 }
 
 }  // namespace blink