Add shill Cellular.ActivateOverNonCellularNetwork property.

BUG=chromium-os:37117
TEST=emerge system_api

Change-Id: I1e51039df70612202206c94e75e041faf27f0216
Reviewed-on: https://gerrit.chromium.org/gerrit/39496
Reviewed-by: Darin Petkov <petkov@chromium.org>
Commit-Ready: Ben Chan <benchan@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
diff --git a/dbus/service_constants.h b/dbus/service_constants.h
index 96df662..481090d 100644
--- a/dbus/service_constants.h
+++ b/dbus/service_constants.h
@@ -699,6 +699,8 @@
     "ShortDNSTimeoutTechnologies";
 
 // Service property names.
+const char kActivateOverNonCellularNetworkProperty[] =
+    "Cellular.ActivateOverNonCellularNetwork";
 const char kEapRemoteCertificationProperty[] = "EAP.RemoteCertification";
 const char kEapSubjectMatchProperty[] = "EAP.SubjectMatch";
 const char kHTTPProxyPortProperty[] = "HTTPProxyPort";