Use EventHandler type instead of EventListener for event handler attributes

Source/modules/filesystem/FileWriter.idl

 /*
  * Copyright (C) 2010 Google Inc.  All rights reserved.
  * Copyright (C) 2011 Apple 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.
@@ skipping 32 matching lines @@
     [RaisesException] void write(Blob data);
     [RaisesException] void seek(long long position);
     [RaisesException] void truncate(long long size);
 
     [RaisesException] void abort();
 
     readonly attribute FileError error;
     readonly attribute long long position;
     readonly attribute long long length;
 
-             attribute EventListener onwritestart;
-             attribute EventListener onprogress;
-             attribute EventListener onwrite;
-             attribute EventListener onabort;
-             attribute EventListener onerror;
-             attribute EventListener onwriteend;
+             attribute EventHandler onwritestart;
+             attribute EventHandler onprogress;
+             attribute EventHandler onwrite;
+             attribute EventHandler onabort;
+             attribute EventHandler onerror;
+             attribute EventHandler onwriteend;
 };