Fix an issue that downloads_by_guid_ map can contain nullptr The issue is caused by an [] accessor. This CL fixes the issue and DCHECK all places we reference items in downloads_by_guid_ Change-Id: Ibf30111ef969d5e6d35f4a31dbcb1a0898267348 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5955567 Reviewed-by: Siddhartha S <ssid@chromium.org> Commit-Queue: Min Qin <qinmin@chromium.org> Cr-Commit-Position: refs/heads/main@{#1372425}
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