Remove trailing commas from Blink IDLs

Source/core/storage/Storage.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
  *    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. 
  */
 
 [
     CustomDeleteProperty,
     CustomEnumerateProperty,
     CustomIndexedSetter,
-    CustomNamedSetter,
+    CustomNamedSetter
 ] interface Storage {
     [RaisesException, ImplementedAs=anonymousIndexedGetter] getter DOMString(unsigned long index);
     [RaisesException, ImplementedAs=anonymousNamedGetter] getter DOMString(DOMString name);
     [NotEnumerable, GetterRaisesException] readonly attribute unsigned long length;
     [NotEnumerable, TreatReturnedNullStringAs=Null, RaisesException] DOMString key(unsigned long index);
     [NotEnumerable, TreatReturnedNullStringAs=Null, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds, RaisesException] DOMString getItem(DOMString key);
     [NotEnumerable, RaisesException, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds] void setItem(DOMString key, DOMString data);
     [NotEnumerable, RaisesException, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds] void removeItem(DOMString key);
     [NotEnumerable, RaisesException, PerWorldBindings, ActivityLog=AccessForIsolatedWorlds] void clear();
 };