Restrict the types of nodes that could be assigned to a slot.

third_party/WebKit/Source/core/dom/NonDocumentTypeChildNode.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NonDocumentTypeChildNode_h
 #define NonDocumentTypeChildNode_h
 
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/Node.h"
 
 namespace blink {
 
 class NonDocumentTypeChildNode {
 public:
     static Element* previousElementSibling(Node& node)
     {
         return ElementTraversal::previousSibling(node);
     }
 
     static Element* nextElementSibling(Node& node)
     {
         return ElementTraversal::nextSibling(node);
     }
-
-    static HTMLSlotElement* assignedSlotForBinding(Node& node)
-    {
-        return node.assignedSlotForBinding();
-    }
 };
 
 } // namespace blink
 
 #endif // NonDocumentTypeChildNode_h