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

Source/core/html/HTMLLegendElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2010 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.
@@ skipping 14 matching lines @@
 #define HTMLLegendElement_h
 
 #include "core/html/HTMLElement.h"
 
 namespace WebCore {
 
 class HTMLFormControlElement;
 
 class HTMLLegendElement FINAL : public HTMLElement {
 public:
-    static PassRefPtrWillBeRawPtr<HTMLLegendElement> create(Document&);
+    DECLARE_NODE_FACTORY(HTMLLegendElement);
 
     HTMLFormElement* form() const;
 
 private:
     explicit HTMLLegendElement(Document&);
 
     // Control in the legend's fieldset that gets focus and access key.
     HTMLFormControlElement* associatedControl();
 
     virtual void accessKeyAction(bool sendMouseEvents) OVERRIDE;
     virtual void focus(bool restorePreviousSelection, FocusType) OVERRIDE;
 };
 
 } //namespace
 
 #endif