Have bindings layer assume and insist that all interface types are GCed.

third_party/WebKit/Source/core/dom/NodeFilter.idl

 /*
  * Copyright (C) 2006, 2007, 2008 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.
  */
 
 // https://dom.spec.whatwg.org/#interface-nodefilter
 
 // FIXME: NodeFilter should be a callback interface. crbug.com/462946
 [
     DependentLifetime,
-    GarbageCollected,
 ] interface NodeFilter {
     // Constants for acceptNode()
     const unsigned short FILTER_ACCEPT = 1;
     const unsigned short FILTER_REJECT = 2;
     const unsigned short FILTER_SKIP = 3;
 
     // Constants for whatToShow
     const unsigned long SHOW_ALL = 0xFFFFFFFF;
     const unsigned long SHOW_ELEMENT = 0x1;
     const unsigned long SHOW_ATTRIBUTE = 0x2; // historical
     const unsigned long SHOW_TEXT = 0x4;
     const unsigned long SHOW_CDATA_SECTION = 0x8; // historical
     const unsigned long SHOW_ENTITY_REFERENCE = 0x10; // historical
     const unsigned long SHOW_ENTITY = 0x20; // historical
     const unsigned long SHOW_PROCESSING_INSTRUCTION = 0x40;
     const unsigned long SHOW_COMMENT = 0x80;
     const unsigned long SHOW_DOCUMENT = 0x100;
     const unsigned long SHOW_DOCUMENT_TYPE = 0x200;
     const unsigned long SHOW_DOCUMENT_FRAGMENT = 0x400;
     const unsigned long SHOW_NOTATION = 0x800; // historical
 
     // FIXME: The node argument should not be optional.
     [RaisesException, LegacyInterfaceTypeChecking] unsigned short acceptNode([Default=Undefined] optional Node node);
 };