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The old code hooked up things to the URLRequestContext that hadn't been
ported over to work with the NetworkService yet, when the NetworkService
was enabled. This CL just does the minimum setup that's needed to not
crash. It also makes requests made with the in-process URLRequestContext
fail when the network service is enabled. These changes will help
identify code that still depends on the legacy path, and allow for some
cleanup of URLRequestContextBuilderMojo and NetworkContext.

Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I4c3f40e6dc3c235844846bff7d1d43d0b1c986d0
Bug: 825242
Reviewed-on: https://chromium-review.googlesource.com/1096075
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567879}