Deprecate unused functions in chromeos_network.cc

These have not been used in Chrome for a very long time.

BUG=none
TEST=build libcros, chrome+libcros

Change-Id: I19a65de6acd7d6f55afbf77e455f7424d89eeabc
Reviewed-on: https://gerrit.chromium.org/gerrit/14336
Tested-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Ready: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Satoru Takabayashi <satorux@chromium.org>
4 files changed