Remove calls to deprecated MessageLoop methods from sandbox/.

sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions_unittests.cc

Index: sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions_unittests.cc
diff --git a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions_unittests.cc b/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions_unittests.cc
index 804a8fea1e750003551e3024b8f858f477de134b..c068cd2d04f95db1128a72b9eeb87d4fe1e42ed9 100644
--- a/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions_unittests.cc
+++ b/sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions_unittests.cc
@@ -13,6 +13,7 @@
 #include <unistd.h>
 
 #include "base/bind.h"
+#include "base/single_thread_task_runner.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/sys_info.h"
 #include "base/threading/thread.h"
@@ -164,7 +165,7 @@ BPF_TEST_C(ParameterRestrictions,
   // different.
   base::Thread getparam_thread("sched_getparam_thread");
   BPF_ASSERT(getparam_thread.Start());
-  getparam_thread.message_loop()->PostTask(
+  getparam_thread.task_runner()->PostTask(
       FROM_HERE, base::Bind(&SchedGetParamThread, &thread_run));
   BPF_ASSERT(thread_run.TimedWait(base::TimeDelta::FromMilliseconds(5000)));
   getparam_thread.Stop();