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This is an existing histogram logged for the Old Download Manager.
The histogram is already a part of histograms.xml file.

Bug: 791806
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I93c0d84e91622654245b7dca88f06c5771e42b65
Reviewed-on: https://chromium-review.googlesource.com/973945Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545071}