Remove calls to deprecated MessageLoop methods on Windows and Linux.

net/test/spawned_test_server/spawner_communicator.cc

Index: net/test/spawned_test_server/spawner_communicator.cc
diff --git a/net/test/spawned_test_server/spawner_communicator.cc b/net/test/spawned_test_server/spawner_communicator.cc
index 05865d94efc50a2afb906e20a51c46468dd0ab4e..952b85c74bf76cf4096fe88d2bd31cc0a6bf7e6e 100644
--- a/net/test/spawned_test_server/spawner_communicator.cc
+++ b/net/test/spawned_test_server/spawner_communicator.cc
@@ -162,9 +162,11 @@ void SpawnerCommunicator::SendCommandAndWaitForResult(
   // Since the method will be blocked until SpawnerCommunicator gets result
   // from the spawner server or timed-out. It's safe to use base::Unretained
   // when using base::Bind.
-  io_thread_.message_loop()->PostTask(FROM_HERE, base::Bind(
-      &SpawnerCommunicator::SendCommandAndWaitForResultOnIOThread,
-      base::Unretained(this), command, post_data, result_code, data_received));
+  io_thread_.task_runner()->PostTask(
+      FROM_HERE,
+      base::Bind(&SpawnerCommunicator::SendCommandAndWaitForResultOnIOThread,
+                 base::Unretained(this), command, post_data, result_code,
+                 data_received));
   WaitForResponse();
 }