Remove calls to MessageLoop::current() in base.

media/capture/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/capture/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/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 {}
@@ skipping 14 matching lines @@
   window_.OnDeviceChange(DBT_DEVNODES_CHANGED, NULL);
   message_loop_.RunUntilIdle();
 }
 
 TEST_F(SystemMessageWindowWinTest, RandomMessage) {
   window_.OnDeviceChange(DBT_DEVICEQUERYREMOVE, NULL);
   message_loop_.RunUntilIdle();
 }
 
 }  // namespace media