Remove the CSSOM.

sky/engine/core/dom/Document.idl

 /*
  * Copyright (C) 2006, 2007, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2006, 2007 Samuel Weinig <sam@webkit.org>
  *
  * 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,
@@ skipping 29 matching lines @@
     [RaisesException, CustomElementCallbacks, TypeChecking=Interface] Node adoptNode(Node node);
 
     [RaisesException] Event createEvent(DOMString eventType);
 
     readonly attribute DOMString? baseURI;
 
     Range createRange();
 
     [ImplementedAs=executingWindow] readonly attribute Window defaultView;
 
-    readonly attribute StyleSheetList styleSheets;
-
     readonly attribute DOMString contentType;
 
              [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString dir;
              [TreatNullAs=NullString, CustomElementCallbacks] attribute DOMString title;
     readonly attribute DOMString referrer;
     readonly attribute DOMString URL;
 
     [PutForwards=href] readonly attribute Location location;
 
     [TreatReturnedNullStringAs=Undefined] readonly attribute DOMString readyState;
@@ skipping 30 matching lines @@
     [CustomElementCallbacks, PerWorldBindings, RaisesException] Element createElement(DOMString localName, DOMString? typeExtension);
 
     // Page visibility API.
     readonly attribute DOMString visibilityState;
     readonly attribute boolean hidden;
 
     readonly attribute HTMLScriptElement currentScript;
 };
 
 Document implements ParentNode;