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This method will be user for reporting Download.IOSDownloadPassKitResult
UMA metric.

Bug: 789735
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ic39d5ea1869dfb4e7f45e0ffa2902829a2e09a6d
Reviewed-on: https://chromium-review.googlesource.com/817950
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Gregory Chatzinoff <gchatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523232}