rib: stop using the global scheduler

Change-Id: I0e205e2f1adf85be49b132b47791b27e4530697a
Refs: #4528
diff --git a/tests/rib/fib-updates-common.hpp b/tests/rib/fib-updates-common.hpp
index f063f5d..66b1c8e 100644
--- a/tests/rib/fib-updates-common.hpp
+++ b/tests/rib/fib-updates-common.hpp
@@ -27,6 +27,7 @@
 #define NFD_TESTS_RIB_FIB_UPDATES_COMMON_HPP
 
 #include "rib/fib-updater.hpp"
+
 #include "rib-test-common.hpp"
 #include "tests/identity-management-fixture.hpp"
 
@@ -63,7 +64,7 @@
 {
 public:
   FibUpdatesFixture()
-    : face(getGlobalIoService(), m_keyChain)
+    : face(g_io, m_keyChain)
     , controller(face, m_keyChain)
     , fibUpdater(rib, controller)
   {