Convert TrayVPN to use new NetworkState code

ash/system/chromeos/network/network_icon.h

Index: ash/system/chromeos/network/network_icon.h
diff --git a/ash/system/chromeos/network/network_icon.h b/ash/system/chromeos/network/network_icon.h
index 06c24912800ba609cdb1c25db0e968940bc07b42..9ea5b7fdfb464348d0ffd9b76848f919344611c1 100644
--- a/ash/system/chromeos/network/network_icon.h
+++ b/ash/system/chromeos/network/network_icon.h
@@ -44,6 +44,10 @@ gfx::ImageSkia GetImageForDisconnectedNetwork(IconType icon_type,
 string16 GetLabelForNetwork(const chromeos::NetworkState* network,
                             IconType icon_type);
 
+// Updates and returns the appropriate message id if the cellular network
+// is uninitialized.
+int GetCellularUninitializedMsg();
+
 }  // namespace network_icon
 }  // namespace ash