Remove getNodesInCommand debug method from Editing commands

Source/core/editing/ReplaceNodeWithSpanCommand.cpp

Index: Source/core/editing/ReplaceNodeWithSpanCommand.cpp
diff --git a/Source/core/editing/ReplaceNodeWithSpanCommand.cpp b/Source/core/editing/ReplaceNodeWithSpanCommand.cpp
index e09b6a13c37d7c1045c1edf45b986fa968df2566..6274c07e34378a928fa9f368665b0f898bfa61c4 100644
--- a/Source/core/editing/ReplaceNodeWithSpanCommand.cpp
+++ b/Source/core/editing/ReplaceNodeWithSpanCommand.cpp
@@ -81,12 +81,4 @@ void ReplaceNodeWithSpanCommand::doUnapply()
     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