Remove getNodesInCommand debug method from Editing commands

Source/core/editing/WrapContentsInDummySpanCommand.h

Index: Source/core/editing/WrapContentsInDummySpanCommand.h
diff --git a/Source/core/editing/WrapContentsInDummySpanCommand.h b/Source/core/editing/WrapContentsInDummySpanCommand.h
index 514f305ae85b35cc82a8a5c8d0f0093815bcc95c..be7f4b6c013752210500ab42b8defc8b626bf2e2 100644
--- a/Source/core/editing/WrapContentsInDummySpanCommand.h
+++ b/Source/core/editing/WrapContentsInDummySpanCommand.h
@@ -47,10 +47,6 @@ private:
     virtual void doReapply() OVERRIDE;
     void executeApply();
 
-#ifndef NDEBUG
-    virtual void getNodesInCommand(HashSet<Node*>&) OVERRIDE;
-#endif
-
     RefPtr<Element> m_element;
     RefPtr<HTMLElement> m_dummySpan;
 };