Apply DEFINE/DECLARE_NODE_FACTORY(T) macro to element factories with single Document& argument.

Source/core/html/HTMLContentElement.h

 /*
  * Copyright (C) 2011 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 20 matching lines @@
 #ifndef HTMLContentElement_h
 #define HTMLContentElement_h
 
 #include "core/css/CSSSelectorList.h"
 #include "core/dom/shadow/InsertionPoint.h"
 
 namespace WebCore {
 
 class HTMLContentElement FINAL : public InsertionPoint {
 public:
-    static PassRefPtrWillBeRawPtr<HTMLContentElement> create(Document&);
-
+    DECLARE_NODE_FACTORY(HTMLContentElement);
     virtual ~HTMLContentElement();
 
     virtual bool canAffectSelector() const OVERRIDE { return true; }
 
     bool canSelectNode(const WillBeHeapVector<RawPtrWillBeMember<Node>, 32>& siblings, int nth) const;
 
     const CSSSelectorList& selectorList() const;
     bool isSelectValid() const;
 
 private:
@@ skipping 33 matching lines @@
     if (!isSelectValid())
         return false;
     if (!siblings[nth]->isElementNode())
         return false;
     return matchSelector(siblings, nth);
 }
 
 }
 
 #endif