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

third_party/WebKit/Source/modules/indexeddb/IDBRequest.idl

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 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.
@@ skipping 22 matching lines @@
     "pending",
     "done"
 };
 
 // http://www.w3.org/TR/IndexedDB/#idl-def-IDBRequest
 
 [
     ActiveScriptWrappable,
     DependentLifetime,
     Exposed=(Window,Worker),
-    GarbageCollected,
 ] interface IDBRequest : EventTarget {
     [RaisesException=Getter, CachedAttribute=isResultDirty] readonly attribute any result;
     [RaisesException=Getter] readonly attribute DOMException error;
 
     readonly attribute any source;
     readonly attribute IDBTransaction transaction;
 
     // States
     readonly attribute IDBRequestReadyState readyState;
 
     // Events
     attribute EventHandler onsuccess;
     attribute EventHandler onerror;
 };