Remove getNodesInCommand debug method from Editing commands

Source/core/editing/AppendNodeCommand.cpp

Index: Source/core/editing/AppendNodeCommand.cpp
diff --git a/Source/core/editing/AppendNodeCommand.cpp b/Source/core/editing/AppendNodeCommand.cpp
index f72b893ae449ab56bda468815f2af227466b3e16..e8047c9a913337a95b258504627caba38749852b 100644
--- a/Source/core/editing/AppendNodeCommand.cpp
+++ b/Source/core/editing/AppendNodeCommand.cpp
@@ -59,12 +59,4 @@ void AppendNodeCommand::doUnapply()
     m_node->remove(IGNORE_EXCEPTION);
 }
 
-#ifndef NDEBUG
-void AppendNodeCommand::getNodesInCommand(HashSet<Node*>& nodes)
-{
-    addNodeAndDescendants(m_parent.get(), nodes);
-    addNodeAndDescendants(m_node.get(), nodes);
-}
-#endif
-
 } // namespace WebCore