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

Source/wtf/text/TextCodecLatin1.h

Index: Source/wtf/text/TextCodecLatin1.h
diff --git a/Source/wtf/text/TextCodecLatin1.h b/Source/wtf/text/TextCodecLatin1.h
index 8d95e793d253ce69229ee43dde4998e4b948186b..92dd372c0de6db927b43ddce5f13e9ef1ad0ecb6 100644
--- a/Source/wtf/text/TextCodecLatin1.h
+++ b/Source/wtf/text/TextCodecLatin1.h
@@ -36,9 +36,9 @@ public:
     static void registerCodecs(TextCodecRegistrar);
 
 private:
-    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);