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This reverts commit 956b131c.

Reason for revert: 
Specualtive revert in order to fix broken test in
https://ci.chromium.org/p/chrome/builders/ci/chromeos-betty-chrome/2747

Original change's description:
> arc: net: remove ARC N legacy APIs
> 
> This patch removes net.mojom APIs and fields only used in ARC N:
>  - NetworkConfiguration mac_address: the host mac_address of a network
>  is now completely hidden in ARC P.
>  - GetDefaultNetwork and DefaultNetworkChanged: ARC P is multinetwork
>  aware and always need the full list of connected services.
> 
> BUG=b:149716479
> BUG=b:145960788
> TEST=Compiled, flashed eve, ran CtsNetTestCases.
> 
> Change-Id: I3368d620d44dd910aae7a12c84c207c3d5cb6cf3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2086362
> Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>
> Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
> Reviewed-by: Dominick Ng <dominickn@chromium.org>
> Commit-Queue: Hugo Benichi <hugobenichi@google.com>
> Cr-Commit-Position: refs/heads/master@{#748094}

TBR=kinaba@chromium.org,jorgelo@chromium.org,hidehiko@chromium.org,mnissler@chromium.org,dominickn@chromium.org,hugobenichi@google.com,garrick@chromium.org,jasongustaman@chromium.org,taoyl@chromium.org

Change-Id: Id248f5e5f23d8c995404f509c30289b77f94e2cc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b:149716479, b:145960788
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094307Reviewed-by: Markus Heintz <markusheintz@chromium.org>
Commit-Queue: Markus Heintz <markusheintz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748217}