DownloadManagerImpl::DownloadManagerImpl(BrowserContext* browser_context)
    : item_factory_(new DownloadItemFactoryImpl()),
      file_factory_(new DownloadFileFactory()),
      shutdown_needed_(true),
      initialized_(false),
      history_db_initialized_(false),
      in_progress_cache_initialized_(false),
      browser_context_(browser_context),
      delegate_(nullptr),
      weak_factory_(this) {
  DCHECK(browser_context);
}

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.