Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/encoding/TextEncoder.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 25 matching lines @@
 #include "wtf/Uint8Array.h"
 #include "wtf/text/TextCodec.h"
 #include "wtf/text/TextEncoding.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class Dictionary;
 class ExceptionState;
 
-class TextEncoder : public RefCounted<TextEncoder> {
+class TextEncoder FINAL : public RefCounted<TextEncoder> {
 public:
     static PassRefPtr<TextEncoder> create(const String& utfLabel, ExceptionState&);
-    virtual ~TextEncoder();
+    ~TextEncoder();
 
     // Implement the IDL
     String encoding() const;
     PassRefPtr<Uint8Array> encode(const String&, const Dictionary&);
 
     using RefCounted<TextEncoder>::ref;
     using RefCounted<TextEncoder>::deref;
 
 private:
     TextEncoder(const String& encoding);
 
     WTF::TextEncoding m_encoding;
     OwnPtr<WTF::TextCodec> m_codec;
 };
 
 } // namespace WebCore
 
 #endif // TextEncoder_h