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This reverts commit a8d13c1d.

Reason for revert: Suspected causing build failure on win32-rel:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/win32-rel/3631

Original change's description:
> Headless: remove devtools protocol network handler
> 
> Network conditions management is now done in content, so support for
> this in headless is redundant.
> 
> Change-Id: I559de2c65e659c026b7e8e9d9021340e6271af92
> Reviewed-on: https://chromium-review.googlesource.com/1255610
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#595637}

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

Change-Id: I0601d25a065e06cff731df50e1dae614ee194dc8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/1256166Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595650}