Remove getNodesInCommand debug method from Editing commands

Source/core/editing/ReplaceNodeWithSpanCommand.cpp

 /*
  * Copyright (c) 2009 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 63 matching lines @@
     swapInNodePreservingAttributesAndChildren(m_spanElement.get(), m_elementToReplace.get());
 }
 
 void ReplaceNodeWithSpanCommand::doUnapply()
 {
     if (!m_spanElement->inDocument())
         return;
     swapInNodePreservingAttributesAndChildren(m_elementToReplace.get(), m_spanElement.get());
 }
 
-#ifndef NDEBUG
-void ReplaceNodeWithSpanCommand::getNodesInCommand(HashSet<Node*>& nodes)
-{
-    addNodeAndDescendants(m_elementToReplace.get(), nodes);
-    addNodeAndDescendants(m_spanElement.get(), nodes);
-}
-#endif
-
 } // namespace WebCore