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

Source/core/html/HTMLKeygenElement.cpp

Index: Source/core/html/HTMLKeygenElement.cpp
diff --git a/Source/core/html/HTMLKeygenElement.cpp b/Source/core/html/HTMLKeygenElement.cpp
index e4f7a53eb175c2583d951e403653891cd673cd89..652fb56eccfdd2f4ef4222260ed8b7a590ff8b34 100644
--- a/Source/core/html/HTMLKeygenElement.cpp
+++ b/Source/core/html/HTMLKeygenElement.cpp
@@ -50,11 +50,6 @@ public:
         return adoptTreeShared(new KeygenSelectElement(document));
     }
 
-    void acceptHeapVisitor(Visitor* visitor) const OVERRIDE
-    {
-        HTMLSelectElement::acceptHeapVisitor(visitor);
-    }
-
 protected:
     KeygenSelectElement(Handle<Document> document)
         : HTMLSelectElement(selectTag, document, 0)
@@ -63,6 +58,11 @@ protected:
         setPseudo(pseudoId);
     }
 
+    void acceptHeapVisitor(Visitor* visitor) const OVERRIDE
+    {
+        HTMLSelectElement::acceptHeapVisitor(visitor);
+    }
+
 private:
     virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren()
     {