Clean up toHTMLFooElement() using DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION

Source/core/html/shadow/HTMLShadowElement.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
     HTMLShadowElement(const QualifiedName&, Document&);
     virtual InsertionNotificationRequest insertedInto(ContainerNode* insertionPoint) OVERRIDE;
 };
 
 inline bool isHTMLShadowElement(const Node* node)
 {
     ASSERT(node);
     return node->hasTagName(HTMLNames::shadowTag);
 }
 
-inline HTMLShadowElement* toHTMLShadowElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLShadowElement(node));
-    return static_cast<HTMLShadowElement*>(node);
-}
-
-inline const HTMLShadowElement* toHTMLShadowElement(const Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLShadowElement(node));
-    return static_cast<const HTMLShadowElement*>(node);
-}
+DEFINE_NODE_TYPE_CASTS(HTMLShadowElement, hasTagName(HTMLNames::shadowTag));
 
 inline bool isActiveShadowInsertionPoint(const Node* node)
 {
     return isHTMLShadowElement(node) && toHTMLShadowElement(node)->isActive();
 }
 
 } // namespace WebCore
 
 #endif // HTMLShadowElement_h