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

Source/core/html/HTMLFormControlElement.h

Index: Source/core/html/HTMLFormControlElement.h
diff --git a/Source/core/html/HTMLFormControlElement.h b/Source/core/html/HTMLFormControlElement.h
index 1c01c007ceb0c55be4ca474289f4d89660e3160a..8b22722dc7524cdd2b246ad9427881eb8b3a1d53 100644
--- a/Source/core/html/HTMLFormControlElement.h
+++ b/Source/core/html/HTMLFormControlElement.h
@@ -105,8 +105,6 @@ public:
 
     virtual void reportMemoryUsage(MemoryObjectInfo*) const OVERRIDE;
 
-    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
-
 protected:
     HTMLFormControlElement(const QualifiedName& tagName, Handle<Document>, HTMLFormElement*);
 
@@ -132,6 +130,8 @@ protected:
 
     bool validationMessageShadowTreeContains(Node*) const;
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     virtual void refFormAssociatedElement() { ref(); }
     virtual void derefFormAssociatedElement() { deref(); }