Remove implementation of Entity constructor

Source/core/dom/Entity.h

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2006, 2008 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,
@@ skipping 10 matching lines @@
 
 #ifndef Entity_h
 #define Entity_h
 
 #include "core/dom/ContainerNode.h"
 
 namespace WebCore {
 
 class Entity : public ContainerNode {
 private:
-    Entity() : ContainerNode(0)
-    {
-        ASSERT_NOT_REACHED();
-        ScriptWrappable::init(this);
-    }
+    Entity(); // Left unimplemented on purpose.
 };
 
 } // namespace WebCore
 
 #endif