Fix virtual/override/final usage in Source/wtf/.

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 24 matching lines @@
 
 namespace WTF {
 
 class TextCodecInput;
 
 class TextCodecICU final : public TextCodec {
 public:
     static void registerEncodingNames(EncodingNameRegistrar);
     static void registerCodecs(TextCodecRegistrar);
 
-    virtual ~TextCodecICU();
+    ~TextCodecICU() override;
 
 private:
     TextCodecICU(const TextEncoding&);
     static PassOwnPtr<TextCodec> create(const TextEncoding&, const void*);
 
-    virtual String decode(const char*, size_t length, FlushBehavior, bool stopOnError, bool& sawError) override;
-    virtual CString encode(const UChar*, size_t length, UnencodableHandling) override;
-    virtual CString encode(const LChar*, size_t length, UnencodableHandling) override;
+    String decode(const char*, size_t length, FlushBehavior, bool stopOnError, bool& sawError) override;
+    CString encode(const UChar*, size_t length, UnencodableHandling) override;
+    CString encode(const LChar*, size_t length, UnencodableHandling) override;
 
     template<typename CharType>
     CString encodeCommon(const CharType*, size_t length, UnencodableHandling);
     CString encodeInternal(const TextCodecInput&, UnencodableHandling);
 
     void createICUConverter() const;
     void releaseICUConverter() const;
 #if defined(USING_SYSTEM_ICU)
     bool needsGBKFallbacks() const { return m_needsGBKFallbacks; }
     void setNeedsGBKFallbacks(bool needsFallbacks) { m_needsGBKFallbacks = needsFallbacks; }
@@ skipping 14 matching lines @@
 public:
     ICUConverterWrapper() : converter(0) { }
     ~ICUConverterWrapper();
 
     UConverter* converter;
 };
 
 } // namespace WTF
 
 #endif // TextCodecICU_h