Function GetSavedFrameAsyncParent 

pub unsafe fn GetSavedFrameAsyncParent(
    cx: &mut JSContext,
    principals: *mut JSPrincipals,
    savedFrame: Handle<'_, *mut JSObject>,
    asyncParentp: MutableHandle<'_, *mut JSObject>,
    selfHosted: SavedFrameSelfHosted,
) -> SavedFrameResult