Have Frame::loader() return a reference

Source/core/timing/PerformanceNavigation.cpp

 /*
  * Copyright (C) 2010 Google Inc. 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 30 matching lines @@
     : DOMWindowProperty(frame)
 {
     ScriptWrappable::init(this);
 }
 
 unsigned short PerformanceNavigation::type() const
 {
     if (!m_frame)
         return TYPE_NAVIGATE;
 
-    DocumentLoader* documentLoader = m_frame->loader()->documentLoader();
+    DocumentLoader* documentLoader = m_frame->loader().documentLoader();
     if (!documentLoader)
         return TYPE_NAVIGATE;
 
     WebCore::NavigationType navigationType = documentLoader->triggeringAction().type();
     switch (navigationType) {
     case NavigationTypeReload:
         return TYPE_RELOAD;
     case NavigationTypeBackForward:
         return TYPE_BACK_FORWARD;
     default:
         return TYPE_NAVIGATE;
     }
 }
 
 unsigned short PerformanceNavigation::redirectCount() const
 {
     if (!m_frame)
         return 0;
 
-    DocumentLoader* loader = m_frame->loader()->documentLoader();
+    DocumentLoader* loader = m_frame->loader().documentLoader();
     if (!loader)
         return 0;
 
     DocumentLoadTiming* timing = loader->timing();
     if (timing->hasCrossOriginRedirect())
         return 0;
 
     return timing->redirectCount();
 }
 
 } // namespace WebCore