Remove getNodesInCommand debug method from Editing commands

Source/core/editing/ReplaceNodeWithSpanCommand.h

Index: Source/core/editing/ReplaceNodeWithSpanCommand.h
diff --git a/Source/core/editing/ReplaceNodeWithSpanCommand.h b/Source/core/editing/ReplaceNodeWithSpanCommand.h
index 4282b2c8c885138e92429d1f34f09bbb0f139163..e9e8afeaa9af7263df1f238e7a81c1834aef4e74 100644
--- a/Source/core/editing/ReplaceNodeWithSpanCommand.h
+++ b/Source/core/editing/ReplaceNodeWithSpanCommand.h
@@ -53,10 +53,6 @@ private:
     virtual void doApply() OVERRIDE;
     virtual void doUnapply() OVERRIDE;
 
-#ifndef NDEBUG
-    virtual void getNodesInCommand(HashSet<Node*>&) OVERRIDE;
-#endif
-
     RefPtr<HTMLElement> m_elementToReplace;
     RefPtr<HTMLElement> m_spanElement;
 };