Simplify compareDocumentPosition

Source/core/dom/Node.h

Index: Source/core/dom/Node.h
diff --git a/Source/core/dom/Node.h b/Source/core/dom/Node.h
index c73d7bf8443d469dd740a80da94765c9c5b94bc7..655b9136d377f607d1171ee6aedb24142bec7d67 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -602,14 +602,12 @@ public:
     virtual bool willRespondToMouseClickEvents();
     virtual bool willRespondToTouchEvents();
 
-    unsigned short compareDocumentPosition(const Node*) const;
-
     enum ShadowTreesTreatment {
         TreatShadowTreesAsDisconnected,
         TreatShadowTreesAsComposed
     };
 
-    unsigned short compareDocumentPositionInternal(const Node*, ShadowTreesTreatment) const;
+    unsigned short compareDocumentPosition(const Node*, ShadowTreesTreatment = TreatShadowTreesAsDisconnected) const;
 
     virtual Node* toNode() OVERRIDE FINAL;