Replace OVERRIDE and FINAL with their C++11 counterparts in WTF

Source/wtf/text/TextCodecReplacement.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TextCodecReplacement_h
 #define TextCodecReplacement_h
 
 #include "wtf/text/TextCodec.h"
 #include "wtf/text/TextCodecUTF8.h"
 
 namespace WTF {
 
-class TextCodecReplacement FINAL : public TextCodecUTF8 {
+class TextCodecReplacement final : public TextCodecUTF8 {
 public:
     TextCodecReplacement();
 
     static void registerEncodingNames(EncodingNameRegistrar);
     static void registerCodecs(TextCodecRegistrar);
 
 private:
-    virtual String decode(const char*, size_t length, FlushBehavior, bool stopOnError, bool& sawError) OVERRIDE;
+    virtual String decode(const char*, size_t length, FlushBehavior, bool stopOnError, bool& sawError) override;
 
     bool m_sentEOF;
 };
 
 } // namespace WTF
 
 #endif // TextCodecReplacement_h