Make CSSStyleDeclaration function arguments non-optional

Source/core/css/CSSStyleDeclaration.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.
  */
 
 // Introduced in DOM Level 2:
 [
     DependentLifetime,
     WillBeGarbageCollected
 ] interface CSSStyleDeclaration {
     [RaisesException=Setter] attribute DOMString?       cssText;
 
-    DOMString?          getPropertyValue([Default=Undefined] optional DOMString propertyName);
-    [RaisesException] DOMString?          removeProperty([Default=Undefined] optional DOMString propertyName);
-    DOMString?          getPropertyPriority([Default=Undefined] optional DOMString propertyName);
-    [RaisesException] void setProperty([Default=Undefined] optional DOMString propertyName,
-                                       [Default=Undefined] optional DOMString? value,
+    DOMString?          getPropertyValue(DOMString propertyName);
+    [RaisesException] DOMString?          removeProperty(DOMString propertyName);
+    DOMString?          getPropertyPriority(DOMString propertyName);
+    [RaisesException] void setProperty(DOMString propertyName,
+                                       DOMString? value,
                                        optional DOMString? priority = null);
 
     readonly attribute unsigned long    length;
-    getter DOMString          item([Default=Undefined] optional unsigned long index);
+    getter DOMString          item(unsigned long index);
     [Custom=(PropertyGetter,PropertyEnumerator,PropertyQuery)] getter (DOMString or float) (DOMString name);
     [Custom] setter void (DOMString propertyName, DOMString? propertyValue);
     readonly attribute CSSRule          parentRule;
 };