Inherit EventTarget interface instead of duplicating its code

Source/core/fileapi/FileReader.h

Index: Source/core/fileapi/FileReader.h
diff --git a/Source/core/fileapi/FileReader.h b/Source/core/fileapi/FileReader.h
index c8482fd7fe381bebe5a915f54307227b030843bd..e1583a68f8654728d2ec7575f7d05bf2f14caed2 100644
--- a/Source/core/fileapi/FileReader.h
+++ b/Source/core/fileapi/FileReader.h
@@ -48,7 +48,7 @@ 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*);