Remove getNodesInCommand debug method from Editing commands

Source/core/editing/SetNodeAttributeCommand.cpp

Index: Source/core/editing/SetNodeAttributeCommand.cpp
diff --git a/Source/core/editing/SetNodeAttributeCommand.cpp b/Source/core/editing/SetNodeAttributeCommand.cpp
index 1218e02a21a8bd177996c28de9cb28f7e59e1847..b4bd12f3a72084e66f031856a30c09751abe85f4 100644
--- a/Source/core/editing/SetNodeAttributeCommand.cpp
+++ b/Source/core/editing/SetNodeAttributeCommand.cpp
@@ -54,11 +54,4 @@ void SetNodeAttributeCommand::doUnapply()
     m_oldValue = nullString;
 }
 
-#ifndef NDEBUG
-void SetNodeAttributeCommand::getNodesInCommand(HashSet<Node*>& nodes)
-{
-    addNodeAndDescendants(m_element.get(), nodes);
-}
-#endif
-
 } // namespace WebCore