Use DEFINE_NODE_TYPE_CASTS instead of using manual toHTMLFooElement()

Source/core/html/HTMLFrameOwnerElement.h

 /*
  * Copyright (C) 2006, 2007, 2009 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 59 matching lines @@
     bool loadOrRedirectSubframe(const KURL&, const AtomicString& frameName, bool lockBackForwardList);
 
 private:
     virtual bool isKeyboardFocusable() const OVERRIDE;
     virtual bool isFrameOwnerElement() const OVERRIDE { return true; }
 
     Frame* m_contentFrame;
     SandboxFlags m_sandboxFlags;
 };
 
-inline HTMLFrameOwnerElement* toHTMLFrameOwnerElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->isFrameOwnerElement());
-    return static_cast<HTMLFrameOwnerElement*>(node);
-}
-
-inline const HTMLFrameOwnerElement* toHTMLFrameOwnerElement(const Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->isFrameOwnerElement());
-    return static_cast<const HTMLFrameOwnerElement*>(node);
-}
+DEFINE_NODE_TYPE_CASTS(HTMLFrameOwnerElement, isFrameOwnerElement());
 
 class SubframeLoadingDisabler {
 public:
     explicit SubframeLoadingDisabler(Node* root)
         : m_root(root)
     {
         disabledSubtreeRoots().add(m_root);
     }
 
     ~SubframeLoadingDisabler()
@@ skipping 16 matching lines @@
         DEFINE_STATIC_LOCAL(HashCountedSet<Node*>, nodes, ());
         return nodes;
     }
 
     Node* m_root;
 };
 
 } // namespace WebCore
 
 #endif // HTMLFrameOwnerElement_h