Use DEFINE_NODE_TYPE_CASTS instead of using manual toSVGFooElement()

Source/core/svg/SVGFEFuncBElement.h

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 16 matching lines @@
 namespace WebCore {
 
 class SVGFEFuncBElement FINAL : public SVGComponentTransferFunctionElement {
 public:
     static PassRefPtr<SVGFEFuncBElement> create(const QualifiedName&, Document&);
 
 private:
     SVGFEFuncBElement(const QualifiedName&, Document&);
 };
 
-inline SVGFEFuncBElement* toSVGFEFuncBElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::feFuncBTag));
-    return static_cast<SVGFEFuncBElement*>(node);
-}
+DEFINE_NODE_TYPE_CASTS(SVGFEFuncBElement, hasTagName(SVGNames::feFuncBTag));
 
 } // namespace WebCore
 
 #endif