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

Source/core/html/HTMLDivElement.h

Index: Source/core/html/HTMLDivElement.h
diff --git a/Source/core/html/HTMLDivElement.h b/Source/core/html/HTMLDivElement.h
index 629b6311756171964d65403ac79ddd224178f6bf..245311b94ac155034c463316302a6b61073fc436 100644
--- a/Source/core/html/HTMLDivElement.h
+++ b/Source/core/html/HTMLDivElement.h
@@ -32,11 +32,11 @@ public:
     static Result<HTMLDivElement> create(Handle<Document>);
     static Result<HTMLDivElement> create(const QualifiedName&, Handle<Document>);
 
-    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
-
 protected:
     HTMLDivElement(const QualifiedName&, Handle<Document>);
 
+    virtual void acceptHeapVisitor(Visitor*) const OVERRIDE;
+
 private:
     virtual bool isPresentationAttribute(const QualifiedName&) const OVERRIDE;
     virtual void collectStyleForPresentationAttribute(const QualifiedName&, const AtomicString&, Handle<MutableStylePropertySet>) OVERRIDE;