The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b83ae72e4bb49182e81914e5bbf933a95213f5d4

commit b83ae72e4bb49182e81914e5bbf933a95213f5d4
Author: Matt Menke <mmenke@chromium.org>
Date: Sat Aug 05 01:04:49 2017

Make StoragePartition always create a NetworkContext.

This will allow code to use NetworkContexts both when the network
service is disabled, and when it's enabled, so the same code works with
and without the network service.

This CL also makes it so the StoragePartition always owns the
NetworkContext, even if the context is created by the embedder.

Bug:  751119 
Change-Id: If63e9f3ba75671c3fb24ce8d956e8ea2d98177dc
Reviewed-on: https://chromium-review.googlesource.com/596229
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Randy Smith <rdsmith@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#492204}
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/chrome/browser/chrome_content_browser_client.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/chrome/browser/net/network_context_configuration_browsertest.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/chrome/browser/net/profile_network_context_service.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/chrome/browser/net/profile_network_context_service.h
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/chrome/browser/net/profile_network_context_service_browsertest.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/chrome/browser/profiles/profile.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/chrome/browser/profiles/profile.h
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/chrome/test/base/testing_profile.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/chrome/test/base/testing_profile.h
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/browser/BUILD.gn
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/browser/DEPS
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/browser/storage_partition_impl.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/browser/storage_partition_impl.h
[add] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/browser/storage_partition_impl_browsertest.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/network/BUILD.gn
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/network/network_context.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/network/network_context.h
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/public/browser/content_browser_client.cc
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/public/browser/content_browser_client.h
[modify] https://crrev.com/b83ae72e4bb49182e81914e5bbf933a95213f5d4/content/test/BUILD.gn

Apologies, applied the wrong component in bulk.