Update WTF classes to use OVERRIDE / FINAL when needed

Source/wtf/text/TextCodecICU.h

 /*
  * Copyright (C) 2004, 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov <ap@nypop.com>
  *
  * 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
@@ skipping 19 matching lines @@
 #include <unicode/utypes.h>
 #include "wtf/text/TextCodec.h"
 #include "wtf/text/TextEncoding.h"
 
 typedef struct UConverter UConverter;
 
 namespace WTF {
 
 class TextCodecInput;
 
-class TextCodecICU : public TextCodec {
+class TextCodecICU FINAL : public TextCodec {
 public:
     static void registerEncodingNames(EncodingNameRegistrar);
     static void registerCodecs(TextCodecRegistrar);
 
     virtual ~TextCodecICU();
 
 private:
     TextCodecICU(const TextEncoding&);
     static PassOwnPtr<TextCodec> create(const TextEncoding&, const void*);
 
@@ skipping 23 matching lines @@
 public:
     ICUConverterWrapper() : converter(0) { }
     ~ICUConverterWrapper();
 
     UConverter* converter;
 };
 
 } // namespace WTF
 
 #endif // TextCodecICU_h