Remove meaningless uses of [TypeChecking=Nullable]

Source/core/svg/SVGPathSegList.idl

 /*
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * Copyright (C) 2006 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.
  */
 
 [
-    TypeChecking=Interface|Nullable,
+    TypeChecking=Interface,
     SetWrapperReferenceTo(SVGElement contextElement),
     ImplementedAs=SVGPathSegListTearOff
 ] interface SVGPathSegList {
     readonly attribute unsigned long length;
     [ImplementedAs=length] readonly attribute unsigned long numberOfItems;
 
     [RaisesException] void clear();
     [RaisesException] SVGPathSeg initialize(SVGPathSeg newItem);
     [RaisesException] getter SVGPathSeg getItem(unsigned long index);
     [RaisesException] setter SVGPathSeg (unsigned long index, SVGPathSeg value);
     [RaisesException] SVGPathSeg insertItemBefore(SVGPathSeg newItem, unsigned long index);
     [RaisesException] SVGPathSeg replaceItem(SVGPathSeg newItem, unsigned long index);
     [RaisesException] SVGPathSeg removeItem(unsigned long index);
     [RaisesException] SVGPathSeg appendItem(SVGPathSeg newItem);
 };