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This reverts commit 031b31c4.

Reason for revert: triggers an assert on in devtools download interception tests with network service.

Original change's description:
> DevTools: fix interception for <a download='...'> downloads with network service
> 
> Bug: 721408
> 
> Change-Id: I60f0cf81a69d7826d2043aa8222d2e69ff9e406a
> Reviewed-on: https://chromium-review.googlesource.com/1006231
> Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
> Reviewed-by: Min Qin <qinmin@chromium.org>
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#550690}

TBR=dgozman@chromium.org,caseq@chromium.org,qinmin@chromium.org

Change-Id: I51f1a7145faa59103ff06b537380745913af2cf2
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 721408
Reviewed-on: https://chromium-review.googlesource.com/1012817Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550710}