Remove calls to deprecated MessageLoop methods in device.

device/serial/serial_service_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "device/serial/serial.mojom.h"
 #include "device/serial/serial_service_impl.h"
 #include "device/serial/test_serial_io_handler.h"
 #include "mojo/public/cpp/bindings/interface_ptr.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace device {
 namespace {
 
@@ skipping 34 matching lines @@
     EXPECT_TRUE(expecting_error_);
   }
 
   void RunMessageLoop() {
     run_loop_.reset(new base::RunLoop);
     run_loop_->Run();
   }
 
   void StopMessageLoop() {
     ASSERT_TRUE(run_loop_);
-    message_loop_.PostTask(FROM_HERE, run_loop_->QuitClosure());
+    message_loop_.task_runner()->PostTask(FROM_HERE, run_loop_->QuitClosure());
   }
 
   void OnGotInfo(serial::ConnectionInfoPtr options) {
     connected_ = true;
     StopMessageLoop();
   }
 
   scoped_refptr<SerialIoHandler> ReturnIoHandler() { return io_handler_; }
 
   void RunConnectTest(const std::string& path, bool expecting_success) {
@@ skipping 60 matching lines @@
 TEST_F(SerialServiceTest, ConnectInvalidPath) {
   RunConnectTest("invalid_path", false);
 }
 
 TEST_F(SerialServiceTest, ConnectOpenFailed) {
   io_handler_ = new FailToOpenIoHandler;
   RunConnectTest("device", false);
 }
 
 }  // namespace device