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Once NetLog moves to NetworkService, it'll be desirable to have the
output files used for netlogs passed in from browser process, since
sandboxing of network service process probably will limit where it
can write on disk.

base::File (mapped as mojo_base.mojom.File) is the preferred way of transferring files per
https://chromium.googlesource.com/chromium/src/+/lkcr/docs/security/mojo.md#Use-structured-types

This doesn't address actually passing in the file or configuring a
separate in-progress directory for the bounded mode (assuming the network
service will have some temp dir it can write to); that would be the next steps.

Bug: 767450
Change-Id: I814d2fdf6d95016e32d08902038fc84b391411b8
Reviewed-on: https://chromium-review.googlesource.com/1005425
Commit-Queue: Maks Orlovich <morlovich@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550181}