Update fetch / loader classes to use OVERRIDE / FINAL when needed

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 28 matching lines @@
 
 class TextTrackLoaderClient : public ResourceOwner<RawResource> {
 public:
     virtual ~TextTrackLoaderClient() { }
 
     virtual void newCuesAvailable(TextTrackLoader*) = 0;
     virtual void cueLoadingCompleted(TextTrackLoader*, bool loadingFailed) = 0;
     virtual void newRegionsAvailable(TextTrackLoader*) = 0;
 };
 
-class TextTrackLoader : public ResourceOwner<RawResource>, private VTTParserClient {
+class TextTrackLoader FINAL : public ResourceOwner<RawResource>, private VTTParserClient {
     WTF_MAKE_NONCOPYABLE(TextTrackLoader);
     WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<TextTrackLoader> create(TextTrackLoaderClient& client, Document& document)
     {
         return adoptPtr(new TextTrackLoader(client, document));
     }
     virtual ~TextTrackLoader();
 
     bool load(const KURL&, const String& crossOriginMode);
@@ skipping 26 matching lines @@
     Document& m_document;
     Timer<TextTrackLoader> m_cueLoadTimer;
     String m_crossOriginMode;
     State m_state;
     bool m_newCuesAvailable;
 };
 
 } // namespace WebCore
 
 #endif