Remove trailing commas from Blink IDLs

Source/core/dom/Element.idl

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 [
-    CustomToV8,
+    CustomToV8
 ] interface Element : Node {
 
     // DOM Level 1 Core
 
     [TreatReturnedNullStringAs=Null, PerWorldBindings] readonly attribute DOMString tagName;
 
     [TreatReturnedNullStringAs=Null] DOMString getAttribute([Default=Undefined] optional DOMString name);
     [RaisesException] void setAttribute([Default=Undefined] optional DOMString name,
                                      [Default=Undefined] optional DOMString value);
     void removeAttribute([Default=Undefined] optional DOMString name);
@@ skipping 167 matching lines @@
     [NotEnumerable, PerWorldBindings] attribute EventListener onsearch;
     [NotEnumerable, PerWorldBindings] attribute EventListener onselectstart;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchstart;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchmove;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchend;
     [NotEnumerable, EnabledAtRuntime=touch, PerWorldBindings] attribute EventListener ontouchcancel;
     [NotEnumerable, PerWorldBindings] attribute EventListener onwebkitfullscreenchange;
     [NotEnumerable, PerWorldBindings] attribute EventListener onwebkitfullscreenerror;
 };