Automated IWYU fix for TaskRunner includes.

media/audio/audio_manager_unittest.cc

 // Copyright 2013 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/audio/audio_manager.h"
 
 #include <memory>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/environment.h"
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/test_message_loop.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "media/audio/audio_device_description.h"
 #include "media/audio/audio_device_info_accessor_for_tests.h"
 #include "media/audio/audio_device_name.h"
 #include "media/audio/audio_output_proxy.h"
 #include "media/audio/audio_unittest_util.h"
@@ skipping 649 matching lines @@
 
   base::FilePath file_path(FILE_PATH_LITERAL("path"));
   EXPECT_CALL(*mock_debug_recording_manager, EnableDebugRecording(file_path));
   audio_manager_->EnableOutputDebugRecording(file_path);
 
   EXPECT_CALL(*mock_debug_recording_manager, DisableDebugRecording());
   audio_manager_->DisableOutputDebugRecording();
 }
 
 }  // namespace media