Remove getNodesInCommand debug method from Editing commands

Source/core/editing/WrapContentsInDummySpanCommand.cpp

Index: Source/core/editing/WrapContentsInDummySpanCommand.cpp
diff --git a/Source/core/editing/WrapContentsInDummySpanCommand.cpp b/Source/core/editing/WrapContentsInDummySpanCommand.cpp
index 67b029f8be644ace969499591e17909e753d2744..dc5290923bb7fe641a5435971dde7dfaf997725d 100644
--- a/Source/core/editing/WrapContentsInDummySpanCommand.cpp
+++ b/Source/core/editing/WrapContentsInDummySpanCommand.cpp
@@ -87,12 +87,4 @@ void WrapContentsInDummySpanCommand::doReapply()
     executeApply();
 }
 
-#ifndef NDEBUG
-void WrapContentsInDummySpanCommand::getNodesInCommand(HashSet<Node*>& nodes)
-{
-    addNodeAndDescendants(m_element.get(), nodes);
-    addNodeAndDescendants(m_dummySpan.get(), nodes);
-}
-#endif
-
 } // namespace WebCore