The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2bdd5022f640fb43f6494b9b44169d0df26e3e5c

commit 2bdd5022f640fb43f6494b9b44169d0df26e3e5c
Author: Xing Liu <xingliu@chromium.org>
Date: Tue Sep 19 17:02:40 2017

Download Service: Fixed an issue in interrupt reason metric.

In Download.Service.Driver.InterruptReason, it tracks all downloads,
this CL changes to only track downloads with guid in download service's
database.



Bug:  765430 
Change-Id: Id2ddf1a5bb39f5fa47c4d301171aa5704c1633a0
Reviewed-on: https://chromium-review.googlesource.com/667246
Commit-Queue: Xing Liu <xingliu@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502869}
[modify] https://crrev.com/2bdd5022f640fb43f6494b9b44169d0df26e3e5c/components/download/content/internal/download_driver_impl.cc
[modify] https://crrev.com/2bdd5022f640fb43f6494b9b44169d0df26e3e5c/components/download/content/internal/download_driver_impl_unittest.cc
[modify] https://crrev.com/2bdd5022f640fb43f6494b9b44169d0df26e3e5c/components/download/internal/controller_impl.cc
[modify] https://crrev.com/2bdd5022f640fb43f6494b9b44169d0df26e3e5c/components/download/internal/controller_impl.h
[modify] https://crrev.com/2bdd5022f640fb43f6494b9b44169d0df26e3e5c/components/download/internal/download_driver.h