Update remaining core classes to use OVERRIDE / FINAL when needed

Source/core/fileapi/FileReaderSync.h

 /*
  * Copyright (C) 2010 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/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class Blob;
 class ExceptionState;
 class FileReaderLoader;
 class ExecutionContext;
 
-class FileReaderSync : public RefCounted<FileReaderSync>, public ScriptWrappable {
+class FileReaderSync FINAL : public RefCounted<FileReaderSync>, public ScriptWrappable {
 public:
     static PassRefPtr<FileReaderSync> create()
     {
         return adoptRef(new FileReaderSync());
     }
 
-    virtual ~FileReaderSync() { }
+    ~FileReaderSync() { }
 
     PassRefPtr<ArrayBuffer> readAsArrayBuffer(ExecutionContext*, Blob*, ExceptionState&);
     String readAsBinaryString(ExecutionContext*, Blob*, ExceptionState&);
     String readAsText(ExecutionContext* executionContext, Blob* blob, ExceptionState& ec)
     {
         return readAsText(executionContext, blob, "", ec);
     }
     String readAsText(ExecutionContext*, Blob*, const String& encoding, ExceptionState&);
     String readAsDataURL(ExecutionContext*, Blob*, ExceptionState&);
 
 private:
     FileReaderSync();
 
     void startLoading(ExecutionContext*, FileReaderLoader&, const Blob&, ExceptionState&);
 };
 
 } // namespace WebCore
 
 #endif // FileReaderSync_h