shill: Support Cellular CDMA activation.

Still TODO is communicating the activation error codes to the Cellular service.
... And, of course, asynchronous calls throughout.

BUG=chromium-os:19305
TEST=unit tests

Change-Id: I3e0b4a5a8d3c4c74db35ce7f74b5d958677d8b66
Reviewed-on: http://gerrit.chromium.org/gerrit/6192
Tested-by: Darin Petkov <petkov@chromium.org>
Reviewed-by: Chris Masone <cmasone@chromium.org>
diff --git a/service_dbus_adaptor.cc b/service_dbus_adaptor.cc
index d6ab4fb..1b3f644 100644
--- a/service_dbus_adaptor.cc
+++ b/service_dbus_adaptor.cc
@@ -85,8 +85,9 @@
                                    ::DBus::Error &error) {
 }
 
-void ServiceDBusAdaptor::ActivateCellularModem(const string& ,
+void ServiceDBusAdaptor::ActivateCellularModem(const string &carrier,
                                                ::DBus::Error &error) {
+  service_->ActivateCellularModem(carrier);
 }
 
 }  // namespace shill