Remove calls to deprecated MessageLoop methods on Windows and Linux.

media/device_monitors/system_message_window_win_unittest.cc

 // Copyright (c) 2012 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 "media/device_monitors/system_message_window_win.h"
 
 #include <dbt.h>
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/system_monitor/system_monitor.h"
 #include "base/test/mock_devices_changed_observer.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 class SystemMessageWindowWinTest : public testing::Test {
  public:
   ~SystemMessageWindowWinTest() override {}
 
  protected:
   void SetUp() override {
     system_monitor_.AddDevicesChangedObserver(&observer_);
   }
 
   base::MessageLoop message_loop_;
   base::SystemMonitor system_monitor_;
   base::MockDevicesChangedObserver observer_;
   SystemMessageWindowWin window_;
 };
 
 TEST_F(SystemMessageWindowWinTest, DevicesChanged) {
   EXPECT_CALL(observer_, OnDevicesChanged(testing::_)).Times(1);
   window_.OnDeviceChange(DBT_DEVNODES_CHANGED, NULL);
-  message_loop_.RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
 }
 
 TEST_F(SystemMessageWindowWinTest, RandomMessage) {
   window_.OnDeviceChange(DBT_DEVICEQUERYREMOVE, NULL);
-  message_loop_.RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace media