Remove use of deprecated MessageLoop methods in chromeos.

chromeos/network/managed_network_configuration_handler_impl.cc

Index: chromeos/network/managed_network_configuration_handler_impl.cc
diff --git a/chromeos/network/managed_network_configuration_handler_impl.cc b/chromeos/network/managed_network_configuration_handler_impl.cc
index 8c69da9dcfb48678ed8fa1760c20a20c83e83d77..e402c6029acd7a730308ebcac363f9e73244a117 100644
--- a/chromeos/network/managed_network_configuration_handler_impl.cc
+++ b/chromeos/network/managed_network_configuration_handler_impl.cc
@@ -14,7 +14,9 @@
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/values.h"
 #include "chromeos/dbus/shill_manager_client.h"
 #include "chromeos/dbus/shill_profile_client.h"
@@ -597,7 +599,7 @@ void ManagedNetworkConfigurationHandlerImpl::OnPoliciesApplied(
   const std::string& userhash = profile.userhash;
   VLOG(1) << "Policy application for user '" << userhash << "' finished.";
 
-  base::MessageLoop::current()->DeleteSoon(
+  base::ThreadTaskRunnerHandle::Get()->DeleteSoon(
       FROM_HERE, policy_applicators_[userhash].release());
   policy_applicators_.erase(userhash);