angular: Jsonp error `Uncaught ReferenceError: __ng_jsonp____req0_finished is not defined` after https://github.com/angular/angular/pull/13219

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[ ] feature request
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Current behavior

hello, after upgrade to 2.4.6, I get Uncaught ReferenceError: __ng_jsonp____req0_finished is not defined as https://github.com/angular/angular/pull/13219#discussion_r90797936

Plunkr http://plnkr.co/edit/WcRnPrJHa04rJy3xTIky?p=preview

And my code is

search(key: string) {
  const params = new URLSearchParams()
  params.set('key', key)
  params.set('jsonpCallback', 'JSONP_CALLBACK')
  return this.jsonp.get('https://c.y.qq.com/splcloud/fcgi-bin/smartbox_new.fcg?' + params)
  .toPromise()
  .then(res => {
    console.log(res)
    return []
  })
}