Remove use of deprecated MessageLoop methods in components.

components/mus/public/cpp/tests/window_server_test_base.cc

Index: components/mus/public/cpp/tests/window_server_test_base.cc
diff --git a/components/mus/public/cpp/tests/window_server_test_base.cc b/components/mus/public/cpp/tests/window_server_test_base.cc
index 22c8244cefef9a24deace9400a579d885b45d8eb..9770bbd20c2f83a94935e77355065eb3ce64b69c 100644
--- a/components/mus/public/cpp/tests/window_server_test_base.cc
+++ b/components/mus/public/cpp/tests/window_server_test_base.cc
@@ -5,9 +5,11 @@
 #include "components/mus/public/cpp/tests/window_server_test_base.h"
 
 #include "base/bind.h"
-#include "base/message_loop/message_loop.h"
+#include "base/location.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/test/test_timeouts.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/cpp/window_tree_client.h"
 #include "components/mus/public/cpp/window_tree_host_factory.h"
@@ -42,7 +44,7 @@ bool WindowServerTestBase::DoRunLoopWithTimeout() {
 
   bool timeout = false;
   base::RunLoop run_loop;
-  base::MessageLoop::current()->PostDelayedTask(
+  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, base::Bind(&TimeoutRunLoop, run_loop.QuitClosure(), &timeout),
       TestTimeouts::action_timeout());