Inherit EventTarget interface instead of duplicating its code

Source/core/svg/SVGElementInstance.idl

 /*
  * Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
-[
-    EventTarget
-] interface SVGElementInstance : EventTarget
+interface SVGElementInstance : EventTarget
 {
     readonly attribute SVGElement correspondingElement;
     readonly attribute SVGUseElement correspondingUseElement;
     readonly attribute SVGElementInstance parentNode;
     readonly attribute SVGElementInstanceList childNodes;
     readonly attribute SVGElementInstance firstChild;
     readonly attribute SVGElementInstance lastChild;
     readonly attribute SVGElementInstance previousSibling;
     readonly attribute SVGElementInstance nextSibling;
 
@@ skipping 32 matching lines @@
     [NotEnumerable] attribute EventListener ondragend;
     [NotEnumerable] attribute EventListener onreset;
     [NotEnumerable] attribute EventListener onresize;
     [NotEnumerable] attribute EventListener onscroll;
     [NotEnumerable] attribute EventListener onsearch;
     [NotEnumerable] attribute EventListener onselect;
     [NotEnumerable] attribute EventListener onselectstart;
     [NotEnumerable] attribute EventListener onsubmit;
     [NotEnumerable] attribute EventListener onunload;
 };