The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/28bcb85f5c7f1e56f57a0b26f9a878196adedb3f

commit 28bcb85f5c7f1e56f57a0b26f9a878196adedb3f
Author: mmenke <mmenke@chromium.org>
Date: Fri Jun 23 01:14:39 2017

NetworkService:  Destroy URLLoaders when a NetworkContext is destroyed.

URLRequests can't outlast the URLRequestContext that spawned them, so
the current code can cause crashes on NetworkContext destruction.

BUG= 735995 

Review-Url: https://codereview.chromium.org/2951293002
Cr-Commit-Position: refs/heads/master@{#481760}

[modify] https://crrev.com/28bcb85f5c7f1e56f57a0b26f9a878196adedb3f/content/browser/loader/test_url_loader_client.cc
[modify] https://crrev.com/28bcb85f5c7f1e56f57a0b26f9a878196adedb3f/content/browser/loader/test_url_loader_client.h
[modify] https://crrev.com/28bcb85f5c7f1e56f57a0b26f9a878196adedb3f/content/network/network_context.cc
[modify] https://crrev.com/28bcb85f5c7f1e56f57a0b26f9a878196adedb3f/content/network/network_context.h
[modify] https://crrev.com/28bcb85f5c7f1e56f57a0b26f9a878196adedb3f/content/network/url_loader_impl.cc
[modify] https://crrev.com/28bcb85f5c7f1e56f57a0b26f9a878196adedb3f/content/network/url_loader_impl.h
[modify] https://crrev.com/28bcb85f5c7f1e56f57a0b26f9a878196adedb3f/content/network/url_loader_unittest.cc
[modify] https://crrev.com/28bcb85f5c7f1e56f57a0b26f9a878196adedb3f/net/test/embedded_test_server/default_handlers.cc

Apologies, applied the wrong component in bulk.