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As noticed in crrev.com/c/2339972, the feature is not used in
services/network anymore, only in content/. This change makes good on my
promise in that CL to fix this state of things in a follow-up CL.

Bug: chromium:986744
Change-Id: I633011b9eb6f5129dac0a31bdef4f0e9471c64e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366753
Commit-Queue: Titouan Rigoudy <titouan@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800967}