Added last_access_time to DownloadItem and History DB

https://codereview.chromium.org/2705283003

atom/browser/api/atom_api_session.cc

@@ -433,6 +433,7 @@ void DownloadIdCallback(content::DownloadManager* download_manager,
       content::DownloadItem::INTERRUPTED,
       content::DownloadDangerType::DOWNLOAD_DANGER_TYPE_NOT_DANGEROUS,
       content::DOWNLOAD_INTERRUPT_REASON_NETWORK_TIMEOUT, false,
+      base::Time()
       std::vector<content::DownloadItem::ReceivedSlice>());
 }