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

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

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
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  * modification, are permitted provided that the following conditions
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 // http://www.w3.org/TR/IndexedDB/#idl-def-IDBFactory
 
 [
     Exposed=(Window,Worker),
-    GarbageCollected
 ] interface IDBFactory {
     [CallWith=ScriptState, ImplementedAs=getDatabaseNames, RaisesException, Measure] IDBRequest webkitGetDatabaseNames();
 
     [CallWith=ScriptState, RaisesException] IDBOpenDBRequest open(DOMString name, [EnforceRange] optional unsigned long long version);
     [CallWith=ScriptState, RaisesException] IDBOpenDBRequest deleteDatabase(DOMString name);
 
     [CallWith=ScriptState, RaisesException] short cmp(any first, any second);
 };