Use EventHandler type instead of EventListener for event handler attributes

Source/modules/indexeddb/IDBOpenDBRequest.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
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 interface IDBOpenDBRequest : IDBRequest {
-    attribute EventListener onblocked;
-    attribute EventListener onupgradeneeded;
+    attribute EventHandler onblocked;
+    attribute EventHandler onupgradeneeded;
 };