Inherit EventTarget interface instead of duplicating its code

Source/modules/filesystem/FileWriter.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 27 matching lines @@
 #include "modules/filesystem/AsyncFileWriterClient.h"
 #include "modules/filesystem/FileWriterBase.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class Blob;
 class ScriptExecutionContext;
 
-class FileWriter : public ScriptWrappable, public FileWriterBase, public ActiveDOMObject, public EventTarget, public AsyncFileWriterClient {
+class FileWriter : public EventTarget, public ScriptWrappable, public FileWriterBase, public ActiveDOMObject, public AsyncFileWriterClient {
 public:
     static PassRefPtr<FileWriter> create(ScriptExecutionContext*);
 
     enum ReadyState {
         INIT = 0,
         WRITING = 1,
         DONE = 2
     };
 
     void write(Blob*, ExceptionCode&);
@@ skipping 64 matching lines @@
     long long m_truncateLength;
     long long m_numAborts;
     long long m_recursionDepth;
     double m_lastProgressNotificationTimeMS;
     RefPtr<Blob> m_blobBeingWritten;
 };
 
 } // namespace WebCore
 
 #endif // FileWriter_h