Remove getNodesInCommand debug method from Editing commands

Source/core/editing/MergeIdenticalElementsCommand.cpp

Index: Source/core/editing/MergeIdenticalElementsCommand.cpp
diff --git a/Source/core/editing/MergeIdenticalElementsCommand.cpp b/Source/core/editing/MergeIdenticalElementsCommand.cpp
index e94a7fb647f621eb76759a1040235ce261c92fd1..2ae2dbba89a5f4878ed37b381ddcb0b1b82f3e92 100644
--- a/Source/core/editing/MergeIdenticalElementsCommand.cpp
+++ b/Source/core/editing/MergeIdenticalElementsCommand.cpp
@@ -86,12 +86,4 @@ void MergeIdenticalElementsCommand::doUnapply()
         m_element1->appendChild(children[i].release(), es);
 }
 
-#ifndef NDEBUG
-void MergeIdenticalElementsCommand::getNodesInCommand(HashSet<Node*>& nodes)
-{
-    addNodeAndDescendants(m_element1.get(), nodes);
-    addNodeAndDescendants(m_element2.get(), nodes);
-}
-#endif
-
 } // namespace WebCore