Use new is*Element() helper functions in CSS code

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 24 matching lines @@
 #include "core/svg/SVGURIReference.h"
 #include "wtf/MathExtras.h"
 #include "wtf/text/StringBuilder.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 static inline SVGCursorElement* resourceReferencedByCursorElement(const String& url, Document& document)
 {
     Element* element = SVGURIReference::targetElementFromIRIString(url, document);
-    if (element && element->hasTagName(SVGNames::cursorTag))
-        return toSVGCursorElement(element);
-
-    return 0;
+    return isSVGCursorElement(element) ? toSVGCursorElement(element) : 0;
 }
 
 CSSCursorImageValue::CSSCursorImageValue(PassRefPtrWillBeRawPtr<CSSValue> imageValue, bool hasHotSpot, const IntPoint& hotSpot)
     : CSSValue(CursorImageClass)
     , m_imageValue(imageValue)
     , m_hasHotSpot(hasHotSpot)
     , m_hotSpot(hotSpot)
     , m_accessedImage(false)
 {
 }
@@ skipping 136 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