Update WebKit IDLs after chrome roll.

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:
 [
-    JSCustomHeader,
-    JSCustomMarkFunction,
-    JSGenerateIsReachable,
-    JSCustomGetOwnPropertySlotAndDescriptor,
     CustomNamedSetter,
 #if defined(V8_BINDING) && V8_BINDING
     NamedGetter,
 #endif
     IndexedGetter,
     CustomEnumerateProperty,
     V8DependentLifetime,
     V8SkipVTableValidation
 ] interface CSSStyleDeclaration {
              [TreatReturnedNullStringAs=Null, TreatNullAs=NullString] attribute DOMString        cssText
                  setter raises(DOMException);
 
     [TreatReturnedNullStringAs=Null] DOMString          getPropertyValue(in [Optional=DefaultIsUndefined] DOMString propertyName);
-    [JSCustom] CSSValue           getPropertyCSSValue(in [Optional=DefaultIsUndefined] DOMString propertyName);
+    CSSValue           getPropertyCSSValue(in [Optional=DefaultIsUndefined] DOMString propertyName);
     [TreatReturnedNullStringAs=Null] DOMString          removeProperty(in [Optional=DefaultIsUndefined] DOMString propertyName)
         raises(DOMException);
     [TreatReturnedNullStringAs=Null] DOMString          getPropertyPriority(in [Optional=DefaultIsUndefined] DOMString propertyName);
     [ObjCLegacyUnnamedParameters] void setProperty(in [Optional=DefaultIsUndefined] DOMString propertyName, 
                                     in [TreatNullAs=NullString,Optional=DefaultIsUndefined] DOMString value, 
                                     in [Optional=DefaultIsUndefined] DOMString priority)
         raises(DOMException);
 
     readonly attribute unsigned long    length;
     DOMString          item(in [Optional=DefaultIsUndefined] unsigned long index);
     readonly attribute CSSRule          parentRule;
 
     // Extensions
     [TreatReturnedNullStringAs=Null] DOMString          getPropertyShorthand(in [Optional=DefaultIsUndefined] DOMString propertyName);
     boolean            isPropertyImplicit(in [Optional=DefaultIsUndefined] DOMString propertyName);
 };