Automated IWYU fix for TaskRunner includes.

remoting/host/linux/audio_pipe_reader.h

 // 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.
 
 #ifndef REMOTING_HOST_LINUX_AUDIO_PIPE_READER_H_
 #define REMOTING_HOST_LINUX_AUDIO_PIPE_READER_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/files/file.h"
 #include "base/files/file_descriptor_watcher_posix.h"
 #include "base/files/file_path.h"
 #include "base/files/file_path_watcher.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/observer_list_threadsafe.h"
+#include "base/single_thread_task_runner.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "remoting/proto/audio.pb.h"
 
 namespace remoting {
 
 struct AudioPipeReaderTraits;
 
 // AudioPipeReader class reads from a named pipe to which an audio server (e.g.
 // pulseaudio) writes the sound that's being played back and then sends data to
@@ skipping 77 matching lines @@
 };
 
 // Destroys |audio_pipe_reader| on the audio thread.
 struct AudioPipeReaderTraits {
   static void Destruct(const AudioPipeReader* audio_pipe_reader);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_LINUX_AUDIO_PIPE_READER_H_