Iron out some kinks in SVG IDL files

Source/core/svg/SVGFEDropShadowElement.idl

 /*
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * 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.
  */
 
 // http://www.w3.org/TR/filter-effects/#InterfaceSVGFEDropShadowElement
 
 interface SVGFEDropShadowElement : SVGElement {
     readonly attribute SVGAnimatedString in1;
     readonly attribute SVGAnimatedNumber dx;
     readonly attribute SVGAnimatedNumber dy;
     readonly attribute SVGAnimatedNumber stdDeviationX;
     readonly attribute SVGAnimatedNumber stdDeviationY;
 
-    void setStdDeviation([Default=Undefined] optional float stdDeviationX,
-                         [Default=Undefined] optional float stdDeviationY);
+    void setStdDeviation(float stdDeviationX, float stdDeviationY);
 };
 
 SVGFEDropShadowElement implements SVGFilterPrimitiveStandardAttributes;