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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}