Oilpan: add transition types to Navigator and its supplements.

Source/core/frame/DOMWindow.h

Index: Source/core/frame/DOMWindow.h
diff --git a/Source/core/frame/DOMWindow.h b/Source/core/frame/DOMWindow.h
index 37cea69a777661e962f35845685853f6a4deb6ed..6769daa66c1b7d589aafb8bae85ef2f024ca1a93 100644
--- a/Source/core/frame/DOMWindow.h
+++ b/Source/core/frame/DOMWindow.h
@@ -352,7 +352,7 @@ enum PageshowEventPersistence {
         mutable RefPtr<BarProp> m_statusbar;
         mutable RefPtr<BarProp> m_toolbar;
         mutable RefPtr<Console> m_console;
-        mutable RefPtr<Navigator> m_navigator;
+        mutable RefPtrWillBePersistent<Navigator> m_navigator;
         mutable RefPtr<Location> m_location;
         mutable RefPtr<StyleMedia> m_media;