Automated IWYU fix for TaskRunner includes.

media/audio/audio_manager.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/audio/audio_manager.h"
 
 #include <stdint.h>
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/power_monitor/power_monitor.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "media/audio/fake_audio_log_factory.h"
 #include "media/base/media_switches.h"
 
 #if defined(OS_MACOSX)
 #include "media/audio/mac/audio_manager_mac.h"
 #endif
 
 #if defined(OS_WIN)
@@ skipping 313 matching lines @@
   } else {
     audio_thread_->GetTaskRunner()->PostTask(
         FROM_HERE, base::Bind(&AudioManager::ShutdownOnAudioThread,
                               base::Unretained(this)));
   }
   audio_thread_->Stop();
   shutdown_ = true;
 }
 
 }  // namespace media