Remove calls to deprecated MessageLoop methods in net.

net/dns/dns_config_service_unittest.cc

Index: net/dns/dns_config_service_unittest.cc
diff --git a/net/dns/dns_config_service_unittest.cc b/net/dns/dns_config_service_unittest.cc
index 97359ee9fb86378179a207fcbfb6e4bda56fd27d..99c29e5445aa211587b46682b65a7b67ccd8b13c 100644
--- a/net/dns/dns_config_service_unittest.cc
+++ b/net/dns/dns_config_service_unittest.cc
@@ -10,6 +10,7 @@
 #include "base/cancelable_callback.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/string_split.h"
 #include "base/test/test_timeouts.h"
@@ -62,7 +63,7 @@ class DnsConfigServiceTest : public testing::Test {
     base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE, closure.callback(), timeout);
     quit_on_config_ = true;
-    base::MessageLoop::current()->Run();
+    base::RunLoop().Run();
     quit_on_config_ = false;
     closure.Cancel();
   }