Comments updated as result of infinite timeout for state keys generated

chromeos/dbus/session_manager_client.h

Index: chromeos/dbus/session_manager_client.h
diff --git a/chromeos/dbus/session_manager_client.h b/chromeos/dbus/session_manager_client.h
index dc009180e75c9ac25c126a4b535a33073a86e0f8..527c92b368790998bec928855de5c8e24e22103a 100644
--- a/chromeos/dbus/session_manager_client.h
+++ b/chromeos/dbus/session_manager_client.h
@@ -211,7 +211,8 @@ class CHROMEOS_EXPORT SessionManagerClient : public DBusClient {
   // for the device to retrieve after a device factory reset.
   //
   // The state keys are returned asynchronously via |callback|. The callback
-  // will be invoked with an empty state key vector in case of errors.
+  // is invoked with an empty state key vector in case of errors. If the time
+  // sync fails or there's no network, the callback is never invoked.
   virtual void GetServerBackedStateKeys(const StateKeysCallback& callback) = 0;
 
   // Used for several ARC methods.  Takes a boolean indicating whether the