Inherit EventTarget interface instead of duplicating its code

Source/core/fileapi/FileReader.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 30 matching lines @@
 #include <wtf/RefCounted.h>
 #include <wtf/text/WTFString.h>
 
 namespace WebCore {
 
 class Blob;
 class ScriptExecutionContext;
 
 typedef int ExceptionCode;
 
-class FileReader : public RefCounted<FileReader>, public ScriptWrappable, public ActiveDOMObject, public EventTarget, public FileReaderLoaderClient {
+class FileReader : public EventTarget, public RefCounted<FileReader>, public ScriptWrappable, public ActiveDOMObject, public FileReaderLoaderClient {
 public:
     static PassRefPtr<FileReader> create(ScriptExecutionContext*);
 
     virtual ~FileReader();
 
     enum ReadyState {
         EMPTY = 0,
         LOADING = 1,
         DONE = 2
     };
@@ skipping 60 matching lines @@
     String m_encoding;
 
     OwnPtr<FileReaderLoader> m_loader;
     RefPtr<FileError> m_error;
     double m_lastProgressNotificationTimeMS;
 };
 
 } // namespace WebCore
 
 #endif // FileReader_h