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

third_party/WebKit/Source/core/xml/XSLTProcessor.idl

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 13 matching lines @@
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 // There is no spec for XSLTProcessor. It was first implemented in Gecko and
 // their interface definition remains the closest thing to a spec:
 // https://hg.mozilla.org/mozilla-central/file/012853bd80b7/dom/webidl/XSLTProcessor.webidl
 
 [
-    GarbageCollected,
     Constructor,
     ConstructorCallWith=Document,
     RuntimeEnabled=XSLT,
     MeasureAs=XSLTProcessor,
 ] interface XSLTProcessor {
 
     void importStylesheet(Node style);
     // TODO(philipj): In Gecko, the transformTo*() methods throw an exception in
     // case of error instead of returning null.
     [CustomElementCallbacks] DocumentFragment? transformToFragment(Node source, Document output);
     [CustomElementCallbacks] Document? transformToDocument(Node source);
 
     // TODO(philipj): In Gecko, it's possible to set and get back any parameter
     // value, not just DOMString.
     void setParameter(DOMString? namespaceURI, DOMString localName, DOMString value);
     DOMString? getParameter(DOMString? namespaceURI, DOMString localName);
     void removeParameter(DOMString? namespaceURI, DOMString localName);
     void clearParameters();
 
     void reset();
 
 };