[extensions] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

extensions/renderer/api/serial/serial_api_unittest.cc

Index: extensions/renderer/api/serial/serial_api_unittest.cc
diff --git a/extensions/renderer/api/serial/serial_api_unittest.cc b/extensions/renderer/api/serial/serial_api_unittest.cc
index 0d247b94aed6acbf2a75c8a4947867df5d537055..508c4a04d6ae516d52818790fb8620040ee9d365 100644
--- a/extensions/renderer/api/serial/serial_api_unittest.cc
+++ b/extensions/renderer/api/serial/serial_api_unittest.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/thread_task_runner_handle.h"
 #include "device/serial/serial_device_enumerator.h"
 #include "device/serial/serial_service_impl.h"
 #include "device/serial/test_serial_io_handler.h"
@@ -439,7 +440,7 @@ class SerialApiTest : public ApiTestBase {
                             new device::SerialConnectionFactory(
                                 base::Bind(&SerialApiTest::GetIoHandler,
                                            base::Unretained(this)),
-                                base::MessageLoopProxy::current()),
+                                base::ThreadTaskRunnerHandle::Get()),
                             scoped_ptr<device::SerialDeviceEnumerator>(
                                 new FakeSerialDeviceEnumerator)),
                         &request);