Make DocumentLoader::timing return a reference

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 2600 matching lines @@
                 window->dispatchEvent(PageTransitionEvent::create(EventTypeNames::pagehide, false), this);
             if (!m_frame)
                 return;
 
             // The DocumentLoader (and thus its DocumentLoadTiming) might get destroyed
             // while dispatching the event, so protect it to prevent writing the end
             // time into freed memory.
             RefPtr<DocumentLoader> documentLoader =  m_frame->loader().provisionalDocumentLoader();
             m_loadEventProgress = UnloadEventInProgress;
             RefPtrWillBeRawPtr<Event> unloadEvent(Event::create(EventTypeNames::unload));
-            if (documentLoader && !documentLoader->timing()->unloadEventStart() && !documentLoader->timing()->unloadEventEnd()) {
-                DocumentLoadTiming* timing = documentLoader->timing();
-                ASSERT(timing->navigationStart());
-                timing->markUnloadEventStart();
+            if (documentLoader && !documentLoader->timing().unloadEventStart() && !documentLoader->timing().unloadEventEnd()) {
+                DocumentLoadTiming& timing = documentLoader->timing();
+                ASSERT(timing.navigationStart());
+                timing.markUnloadEventStart();
                 m_frame->localDOMWindow()->dispatchEvent(unloadEvent, this);
-                timing->markUnloadEventEnd();
+                timing.markUnloadEventEnd();
             } else {
                 m_frame->localDOMWindow()->dispatchEvent(unloadEvent, m_frame->document());
             }
         }
         m_loadEventProgress = UnloadEventHandled;
     }
 
     if (!m_frame)
         return;
 
@@ skipping 3132 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif