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This also prevents any crashes if we remove the legacy URLRequestContext
getter in the network service.

Bug: 855621
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: Ie14b64b803c8563ecae355dc220c9e56d11b4e7b
Reviewed-on: https://chromium-review.googlesource.com/1176117Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583388}