Oilpan: RenderMenuList should call PopupMenu::disconnectClient in destroy().

Source/core/rendering/RenderMenuList.h

Index: Source/core/rendering/RenderMenuList.h
diff --git a/Source/core/rendering/RenderMenuList.h b/Source/core/rendering/RenderMenuList.h
index d7df6f8bd3f1fd0b079e93df5759218725b649d6..276a51713366a2dc45946d06a3efc858d2d10ff2 100644
--- a/Source/core/rendering/RenderMenuList.h
+++ b/Source/core/rendering/RenderMenuList.h
@@ -39,9 +39,9 @@ class RenderMenuList FINAL : public RenderFlexibleBox, private PopupMenuClient {
 public:
     RenderMenuList(Element*);
     virtual ~RenderMenuList();
+    virtual void destroy() OVERRIDE;
     virtual void trace(Visitor*) OVERRIDE;
 
-public:
     bool popupIsVisible() const { return m_popupIsVisible; }
     void showPopup();
     void hidePopup();