shill: Set the cellular service friendly name.

BUG=chromium-os:24897
TEST=unit tests, tested on device with GSM

Change-Id: I2fe803822f2ddc5c52daddcf625b3327f95563ad
Reviewed-on: https://gerrit.chromium.org/gerrit/13933
Commit-Ready: Darin Petkov <petkov@chromium.org>
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Darin Petkov <petkov@chromium.org>
diff --git a/cellular.cc b/cellular.cc
index 648f31b..4b3a82f 100644
--- a/cellular.cc
+++ b/cellular.cc
@@ -419,4 +419,9 @@
   home_provider_.CopyFrom(oper);
 }
 
+string Cellular::CreateFriendlyServiceName() {
+  VLOG(2) << __func__;
+  return capability_.get() ? capability_->CreateFriendlyServiceName() : "";
+}
+
 }  // namespace shill