[oilpan] The Node hierarchy should have correct accept method chains

Source/core/html/shadow/DateTimeFieldElement.h

Index: Source/core/html/shadow/DateTimeFieldElement.h
diff --git a/Source/core/html/shadow/DateTimeFieldElement.h b/Source/core/html/shadow/DateTimeFieldElement.h
index 9fa9b263eaea4625822191c26953ae2d8394e739..9a76f2427374a72817a12be4de3a0df725454458 100644
--- a/Source/core/html/shadow/DateTimeFieldElement.h
+++ b/Source/core/html/shadow/DateTimeFieldElement.h
@@ -78,8 +78,6 @@ public:
     virtual String value() const = 0;
     virtual String visibleValue() const = 0;
 
-    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
-
 protected:
     DateTimeFieldElement(Handle<Document>, FieldOwner&);
     virtual void didBlur();
@@ -93,6 +91,8 @@ protected:
     virtual int valueAsInteger() const = 0;
     virtual int valueForARIAValueNow() const;
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     void defaultKeyboardEventHandler(KeyboardEvent*);
     virtual bool isDateTimeFieldElement() const OVERRIDE;