Introduce CSS_VALUE_TYPE_CASTS macro to cast CSSValue

Source/core/css/CSSCursorImageValue.cpp

Index: Source/core/css/CSSCursorImageValue.cpp
diff --git a/Source/core/css/CSSCursorImageValue.cpp b/Source/core/css/CSSCursorImageValue.cpp
index 24caef773da3770a51b37011994a0a3339594cbe..65c42d8d3ec16ad53b6d6896b7dfb1b8654aa338 100644
--- a/Source/core/css/CSSCursorImageValue.cpp
+++ b/Source/core/css/CSSCursorImageValue.cpp
@@ -122,7 +122,7 @@ bool CSSCursorImageValue::updateIfSVGCursorIsUsed(Element* element)
 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;
@@ -155,7 +155,7 @@ 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);