Use a TextTrackLoaderClient reference (not pointer)

Source/core/loader/TextTrackLoader.h

 /*
  * Copyright (C) 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 34 matching lines @@
     virtual void newCuesAvailable(TextTrackLoader*) = 0;
     virtual void cueLoadingStarted(TextTrackLoader*) = 0;
     virtual void cueLoadingCompleted(TextTrackLoader*, bool loadingFailed) = 0;
     virtual void newRegionsAvailable(TextTrackLoader*) = 0;
 };
 
 class TextTrackLoader : public RawResourceClient, private WebVTTParserClient {
     WTF_MAKE_NONCOPYABLE(TextTrackLoader);
     WTF_MAKE_FAST_ALLOCATED;
 public:
-    static PassOwnPtr<TextTrackLoader> create(TextTrackLoaderClient* client, Document& document)
+    static PassOwnPtr<TextTrackLoader> create(TextTrackLoaderClient& client, Document& document)
     {
         return adoptPtr(new TextTrackLoader(client, document));
     }
     virtual ~TextTrackLoader();
 
     bool load(const KURL&, const String& crossOriginMode);
     void cancelLoad();
 
     enum State { Idle, Loading, Finished, Failed };
     State loadState() { return m_state; }
 
     void getNewCues(Vector<RefPtr<TextTrackCue> >& outputCues);
     void getNewRegions(Vector<RefPtr<TextTrackRegion> >& outputRegions);
 private:
 
     // RawResourceClient
     virtual void dataReceived(Resource*, const char* data, int length) OVERRIDE;
     virtual void notifyFinished(Resource*) OVERRIDE;
 
     // WebVTTParserClient
     virtual void newCuesParsed() OVERRIDE;
     virtual void newRegionsParsed() OVERRIDE;
     virtual void fileFailedToParse() OVERRIDE;
 
-    TextTrackLoader(TextTrackLoaderClient*, Document&);
+    TextTrackLoader(TextTrackLoaderClient&, Document&);
 
     void cueLoadTimerFired(Timer<TextTrackLoader>*);
     void corsPolicyPreventedLoad();
 
-    TextTrackLoaderClient* m_client;
+    TextTrackLoaderClient& m_client;
     OwnPtr<WebVTTParser> m_cueParser;
     ResourcePtr<RawResource> m_resource;
     // FIXME: Remove this pointer and get the Document from m_client.
     Document& m_document;
     Timer<TextTrackLoader> m_cueLoadTimer;
     String m_crossOriginMode;
     State m_state;
     bool m_newCuesAvailable;
 };
 
 } // namespace WebCore
 
 #endif