tree 5bc5b1f98eb5639f9ec13de00a08007380cb9e38
parent bdd0c8bf5dfcbcc7ac57ea88545f0ad9bc25f8f7
author Jason Glasgow <jglasgow@chromium.org> 1330037857 -0500
committer Gerrit <chrome-bot@google.com> 1330448355 -0800

shill: modem: unregister the cellular device when deleting a modem

Unregister the cellular device so that the chain of refences to the
device are all dropped when the modem disappears.  The references are
from DeviceInfo, Manager, Modem and Service.  Calling deregister
remove the device info reference, and will cause the manager to stop
the device, which will in turn clean up the service.  Deleting the
modem will drop the last reference.

BUG=chromium-os:26796, chromium-os:26300
TEST=run shill, list-devices, stop cromo, list-devices, start cromo,
     /opt/Qualcomm/bin/powercycle-all-gobis

Change-Id: Ia10932cc3c644bbf5accd69e02b85c75dc783b11
Reviewed-on: https://gerrit.chromium.org/gerrit/16546
Commit-Ready: Jason Glasgow <jglasgow@chromium.org>
Reviewed-by: Jason Glasgow <jglasgow@chromium.org>
Tested-by: Jason Glasgow <jglasgow@chromium.org>