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This patch populates new fields relative to the host IP configuration
added in Change-Id I08dfd5daa9ba2946a847e555bb94a01da3866eb9 to
NetworkConfiguration mojo objects.

Currently, layer 3 information can come from shill Device properties
(kIPConfigsProperty) or from shill Service properties
(kIPConfigProperty, kSavedIPConfigProperty, kStaticIPConfigProperty).

This patch changes the order in which this properties are tried to
prioritize Device properties.

BUG=b:143258259
BUG=b:145960788
BUG=crbug:795603
TEST=Compiled, flashed eve, checked that ARC++ sees the host IPv4 and
IPv6 configuration, mtu, and search domains for following networks: eth,
wifi, L2TP vpn connections, Chrome extension VPN connections.

Change-Id: I6d5e6b6eed477b0aef762d2b18b8ef2ce9fa2ff9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1962129
Commit-Queue: Hugo Benichi <hugobenichi@google.com>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774528}