Introduce CSS_VALUE_TYPE_CASTS macro to cast CSSValue

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 104 matching lines @@
         cursorElement->addClient(svgElement);
         return true;
     }
 
     return false;
 }
 
 StyleImage* CSSCursorImageValue::cachedImage(ResourceFetcher* loader, float deviceScaleFactor)
 {
     if (m_imageValue->isImageSetValue())
-        return static_cast<CSSImageSetValue*>(m_imageValue.get())->cachedImageSet(loader, deviceScaleFactor);
+        return toCSSImageSetValue(m_imageValue.get())->cachedImageSet(loader, deviceScaleFactor);
 
     if (!m_accessedImage) {
         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()) {
             RefPtr<CSSImageValue> imageValue = toCSSImageValue(m_imageValue.get());
             // FIXME: This will fail if the <cursor> element is in a shadow DOM (bug 59827)
@@ skipping 12 matching lines @@
     if (m_image && m_image->isImageResource())
         return static_cast<StyleFetchedImage*>(m_image.get());
 
     return 0;
 }
 
 StyleImage* CSSCursorImageValue::cachedOrPendingImage(float deviceScaleFactor)
 {
     // Need to delegate completely so that changes in device scale factor can be handled appropriately.
     if (m_imageValue->isImageSetValue())
-        return static_cast<CSSImageSetValue*>(m_imageValue.get())->cachedOrPendingImageSet(deviceScaleFactor);
+        return toCSSImageSetValue(m_imageValue.get())->cachedOrPendingImageSet(deviceScaleFactor);
 
     if (!m_image)
         m_image = StylePendingImage::create(this);
 
     return m_image.get();
 }
 
 bool CSSCursorImageValue::isSVGCursor() const
 {
     if (m_imageValue->isImageValue()) {
@@ skipping 22 matching lines @@
     m_referencedElements.remove(element);
 }
 
 bool CSSCursorImageValue::equals(const CSSCursorImageValue& other) const
 {
     return m_hasHotSpot ? other.m_hasHotSpot && m_hotSpot == other.m_hotSpot : !other.m_hasHotSpot
         && compareCSSValuePtr(m_imageValue, other.m_imageValue);
 }
 
 } // namespace WebCore