Mark Supplement instead of RefCountedSupplement in NavigatorContentUtils

Source/modules/navigatorcontentutils/NavigatorContentUtils.h

Index: Source/modules/navigatorcontentutils/NavigatorContentUtils.h
diff --git a/Source/modules/navigatorcontentutils/NavigatorContentUtils.h b/Source/modules/navigatorcontentutils/NavigatorContentUtils.h
index c4971b773893f1736397401cc797750746a47882..c6033c2c0348567d3646e9f7453b59026586d050 100644
--- a/Source/modules/navigatorcontentutils/NavigatorContentUtils.h
+++ b/Source/modules/navigatorcontentutils/NavigatorContentUtils.h
@@ -38,19 +38,21 @@ class ExceptionState;
 class Navigator;
 class Page;
 
-class NavigatorContentUtils FINAL : public RefCountedSupplement<Page, NavigatorContentUtils> {
+class NavigatorContentUtils FINAL : public Supplement<Page> {
 public:
     virtual ~NavigatorContentUtils();
 
-    static const char* supplementName();
     static NavigatorContentUtils* from(Page&);
+    static const char* supplementName();
 
     static void registerProtocolHandler(Navigator&, const String& scheme, const String& url, const String& title, ExceptionState&);
 
     static String isProtocolHandlerRegistered(Navigator&, const String& scheme, const String& url, ExceptionState&);
     static void unregisterProtocolHandler(Navigator&, const String& scheme, const String& url, ExceptionState&);
 
-    static PassRefPtr<NavigatorContentUtils> create(PassOwnPtr<NavigatorContentUtilsClient>);
+    static PassOwnPtr<NavigatorContentUtils> create(PassOwnPtr<NavigatorContentUtilsClient>);
+
+    virtual void trace(Visitor*) OVERRIDE { }
 
 private:
     explicit NavigatorContentUtils(PassOwnPtr<NavigatorContentUtilsClient> client)