Pass implementation object to supplemental classes by reference

Source/core/frame/NavigatorOnLine.h

 /*
  * Copyright (C) 2013 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 17 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef NavigatorOnLine_h
 #define NavigatorOnLine_h
 
 #include "core/page/NetworkStateNotifier.h"
 
 namespace WebCore {
 
+class NavigatorBase;
+
 class NavigatorOnLine {
 public:
-    static bool onLine(void*)
+    static bool onLine(NavigatorBase&)
     {
         return networkStateNotifier().onLine();
     }
 };
 
 }
 
 #endif // NavigatorOnLine_h