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

third_party/WebKit/Source/modules/webaudio/AudioContext.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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 16 matching lines @@
     "suspended",
     "running",
     "closed"
 };
 
 [
     ActiveScriptWrappable,
     Constructor,
     ConstructorCallWith=Document,
     DependentLifetime,
-    GarbageCollected,
     ImplementedAs=AbstractAudioContext,
     NoInterfaceObject,
     RaisesException=Constructor,
 ] interface AudioContext : EventTarget {
     // All rendered audio ultimately connects to destination, which represents the audio hardware.
     readonly attribute AudioDestinationNode destination;
 
     // All scheduled times are relative to this time in seconds.
     readonly attribute double currentTime;
 
@@ skipping 40 matching lines @@
 
     // Close
     [MeasureAs=AudioContextClose, CallWith=ScriptState, ImplementedAs=closeContext] Promise<void> close();
 
     // Pause/resume
     [MeasureAs=AudioContextSuspend, CallWith=ScriptState, ImplementedAs=suspendContext] Promise<void> suspend();
     [MeasureAs=AudioContextResume, CallWith=ScriptState, ImplementedAs=resumeContext] Promise<void> resume();
 
     attribute EventHandler onstatechange;
 };