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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/+/2086362Reviewed-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}