chromeos: remove usage of obsolete shill.Device.SetCarrier API

The shill.Device.SetCarrier API only works on the modems supported by
cromo and it is being deprecated along with cromo. This CL removes all
usage of the shill.Device.SetCarrier API from Chrome.

Bug: 954634
Change-Id: I9114650783f9c3f848c4012db718ca4caa8f1803
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1586460
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654702}
15 files changed