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This CL deletes histogram Download.Service.Finish.ReportedHash. Over
99% of background downloads have hash, it's not very actionable.

Bug: 995485
Change-Id: I1176f5d37d608e99eba0acf8fdfa50ea938d5569
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1803880Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Nik Bhagat <nikunjb@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697769}