Bug: delayWhen operator returns an Observable that does not complete.

[plul]

RxJS version:
5.3.0

Code to reproduce:

Rx.Observable.of('foo')
  .delayWhen(function() {
    return Rx.Observable.of('bar');
  })
  .subscribe({
    next: function(x) {
      console.log('next');
    },
    complete: function() {
      console.log('complete');
    }
  });

Expected behavior:
Output
'next'
'complete'

Actual behavior:
Output
'next'

Additional information:
If you substitute delayWhen(...) for say delay(1000) in the above, it will emit complete as expected.

Here is a jsFiddle using https://unpkg.com/rxjs/bundles/Rx.min.js showcasing the issue.

[lock]

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