Add interrupt reasons if response was not started before it completes

If a download is getting no response while it completes, it shouldn't carry
the DOWNLOAD_INTERRUPT_REASON_NONE reason.
Otherwise, it will fail the DCHECK in InProgressDownloadManager::StartDownload().
This CL fixes the issue by adding the NETWORK_FAILED reason to the download.

BUG=900149

Change-Id: Ic068691f8bc5146fba92e75894eec74ce5c54bc8
Reviewed-on: https://chromium-review.googlesource.com/c/1308672Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604813}

components/download/internal/common/download_response_handler.cc

@@ -224,7 +224,9 @@ void DownloadResponseHandler::OnComplete(
   // happen when the request was aborted.
   if (!create_info_)
     create_info_ = CreateDownloadCreateInfo(network::ResourceResponseHead());
-  create_info_->result = reason;
+  create_info_->result = reason == DOWNLOAD_INTERRUPT_REASON_NONE
+                             ? DOWNLOAD_INTERRUPT_REASON_NETWORK_FAILED
+                             : reason;
 
   OnResponseStarted(mojom::DownloadStreamHandlePtr());
   delegate_->OnResponseCompleted();