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

third_party/WebKit/Source/core/html/HTMLAllCollection.idl

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Samsung Electronics. 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 12 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 // https://html.spec.whatwg.org/#the-htmlallcollection-interface
 
 [
     Custom=LegacyCallAsFunction,
     DependentLifetime,
     SetWrapperReferenceFrom=ownerNode,
-    GarbageCollected,
 ] interface HTMLAllCollection {
     readonly attribute unsigned long length;
     [ImplementedAs=item] getter Element (unsigned long index);
     // FIXME: The custom item() implementation may return a NodeList, but the
     // spec has a (HTMLCollection or Element)? item(DOMString name) method.
     [Custom] Element? item([Default=Undefined] optional unsigned long index);
     // FIXME: namedItem() should be a legacycaller. crbug.com/465009
     // FIXME: namedItem() should return an (HTMLCollection or Element)? union.
     [ImplementedAs=namedGetter] getter (NodeList or Element)? namedItem(DOMString name);
 };