Use EventHandler type instead of EventListener for event handler attributes

Source/modules/notifications/Notification.idl

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2011, 2012 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 25 matching lines @@
     ConstructorCallWith=ScriptExecutionContext,
 ] interface Notification : EventTarget {
     void show();
     [Conditional=LEGACY_NOTIFICATIONS] void cancel();
     [Conditional=NOTIFICATIONS] void close();
 
 
     [CallWith=ScriptExecutionContext, Conditional=NOTIFICATIONS] static readonly attribute DOMString permission;
     [CallWith=ScriptExecutionContext, Conditional=NOTIFICATIONS] static void requestPermission(optional NotificationPermissionCallback callback);
 
-    attribute EventListener onshow;
-    [Conditional=LEGACY_NOTIFICATIONS] attribute EventListener ondisplay;
-    attribute EventListener onerror;
-    attribute EventListener onclose;
-    attribute EventListener onclick;
+    attribute EventHandler onshow;
+    [Conditional=LEGACY_NOTIFICATIONS] attribute EventHandler ondisplay;
+    attribute EventHandler onerror;
+    attribute EventHandler onclose;
+    attribute EventHandler onclick;
 
     [Conditional=LEGACY_NOTIFICATIONS] attribute DOMString dir;
     [Conditional=LEGACY_NOTIFICATIONS] attribute DOMString replaceId;
     [Conditional=NOTIFICATIONS] attribute DOMString tag;
 };