Use EventHandler type instead of EventListener for event handler attributes

Source/core/workers/WorkerGlobalScope.idl

 /*
  * Copyright (C) 2008 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 16 matching lines @@
 [
     GlobalContext=WorkerGlobalScope,
     CustomToV8,
     DoNotGenerateWrap
 ] interface WorkerGlobalScope : EventTarget {
 
     // WorkerGlobalScope
     [Replaceable] readonly attribute WorkerGlobalScope self;
     [Replaceable] readonly attribute WorkerLocation location;
     void close();
-    attribute EventListener onerror;
+    attribute EventHandler onerror;
 
     // WorkerUtils
     [Custom] void importScripts(/*[Variadic] in DOMString urls */);
     [Replaceable] readonly attribute WorkerNavigator navigator;
 
     // Additional constructors
     attribute URLConstructor webkitURL; // FIXME: deprecate this.
 };
 
 WorkerGlobalScope implements WindowBase64;
 WorkerGlobalScope implements WindowTimers;