dbus/dhcpcd-dbus.conf

<!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
 "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
<busconfig>
  <!-- Both root and dhcp can own the dhcpcd service -->
  <policy user="root">
    <allow own="org.chromium.dhcpcd"/>
    <allow send_interface="org.chromium.dhcpcd" />
    <allow send_destination="org.chromium.dhcpcd" />
  </policy>
  <policy user="dhcp">
    <allow own="org.chromium.dhcpcd"/>
    <allow send_interface="org.chromium.dhcpcd" />
    <allow send_destination="org.chromium.dhcpcd" />
  </policy>

  <policy context="default">
    <allow send_interface="org.chromium.dhcpcd" />
    <allow send_interface="org.freedesktop.DBus.Introspectable" />
    <allow send_destination="org.chromium.dhcpcd" />
</policy>
</busconfig>