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This value is logged when the user quits the app during in-progress
downloads.

Bug: 981327
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: If19c9e16045ab0af2af1a77a941df843cc6fdeb8
Reviewed-on: https://chromium-review.googlesource.com/987200
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547986}