Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/encoding/TextDecoder.h

 /*
  * Copyright (C) 2013 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 24 matching lines @@
 #include "wtf/ArrayBufferView.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/TextCodec.h"
 #include "wtf/text/TextEncoding.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class ExceptionState;
 
-class TextDecoder : public RefCounted<TextDecoder> {
+class TextDecoder FINAL : public RefCounted<TextDecoder> {
 public:
     static PassRefPtr<TextDecoder> create(const String& label, const Dictionary&, ExceptionState&);
-    virtual ~TextDecoder();
+    ~TextDecoder();
 
     // Implement the IDL
     String encoding() const;
     String decode(ArrayBufferView*, const Dictionary&, ExceptionState&);
     String decode(ExceptionState& exceptionState) { return decode(0, Dictionary(), exceptionState); }
 
     using RefCounted<TextDecoder>::ref;
     using RefCounted<TextDecoder>::deref;
 
 private:
     TextDecoder(const String& encoding, bool fatal);
 
     WTF::TextEncoding m_encoding;
     OwnPtr<WTF::TextCodec> m_codec;
     bool m_fatal;
     bool m_bomSeen;
 };
 
 } // namespace WebCore
 
 #endif // TextDecoder_h