Remove getNodesInCommand debug method from Editing commands

Source/core/editing/InsertNodeBeforeCommand.cpp

Index: Source/core/editing/InsertNodeBeforeCommand.cpp
diff --git a/Source/core/editing/InsertNodeBeforeCommand.cpp b/Source/core/editing/InsertNodeBeforeCommand.cpp
index f6872e7dca64f166c1dcea54bd4ef740258de825..16ff925d004a1db43a178e741d6e3857ea56d56b 100644
--- a/Source/core/editing/InsertNodeBeforeCommand.cpp
+++ b/Source/core/editing/InsertNodeBeforeCommand.cpp
@@ -64,12 +64,4 @@ void InsertNodeBeforeCommand::doUnapply()
     m_insertChild->remove(IGNORE_EXCEPTION);
 }
 
-#ifndef NDEBUG
-void InsertNodeBeforeCommand::getNodesInCommand(HashSet<Node*>& nodes)
-{
-    addNodeAndDescendants(m_insertChild.get(), nodes);
-    addNodeAndDescendants(m_refChild.get(), nodes);
-}
-#endif
-
 }