Be more strict about attributes in sky-binder.

sky/engine/core/dom/Element.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,
@@ skipping 51 matching lines @@
     [PerWorldBindings] readonly attribute DOMTokenList classList;
 
     [RaisesException] ShadowRoot ensureShadowRoot();
     [PerWorldBindings] readonly attribute ShadowRoot shadowRoot;
     NodeList getDestinationInsertionPoints();
 
     // CSSOM View Module API
     ClientRectList getClientRects();
     ClientRect getBoundingClientRect();
 
-    [Reflect] attribute DOMString title;
     [Reflect] attribute DOMString lang;
     attribute DOMString dir;
 
     [CustomElementCallbacks] attribute long tabIndex;
     [Reflect] attribute DOMString accessKey;
 
     [RuntimeEnabled=IMEAPI] readonly attribute InputMethodContext inputMethodContext;
 
     [CustomElementCallbacks, RaisesException=Setter] attribute DOMString contentEditable;
     readonly attribute boolean isContentEditable;
 
     attribute boolean spellcheck;
 
     void click();
 };
 
 Element implements ParentNode;
 Element implements ChildNode;