void DownloadItemImpl::MarkAsComplete() {
  DCHECK_CURRENTLY_ON(BrowserThread::UI);

  DCHECK(AllDataSaved());
  destination_info_.end_time = base::Time::Now();
  TransitionTo(COMPLETE_INTERNAL);
  UpdateObservers();
}

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.