Revert of Pass task runners to AudioManager constructor.

components/audio_modem/audio_player_impl.h

 // Copyright 2015 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 COMPONENTS_AUDIO_MODEM_AUDIO_PLAYER_IMPL_H_
 #define COMPONENTS_AUDIO_MODEM_AUDIO_PLAYER_IMPL_H_
 
 #include <stdint.h>
 
 #include <vector>
@@ skipping 47 matching lines @@
   void StopAndCloseOnAudioThread();
   void FinalizeOnAudioThread();
 
   // AudioOutputStream::AudioSourceCallback overrides:
   // Following methods could be called from *ANY* thread.
   int OnMoreData(media::AudioBus* dest,
                  uint32_t total_bytes_delay,
                  uint32_t frames_skipped) override;
   void OnError(media::AudioOutputStream* stream) override;
 
+  // Flushes the audio loop, making sure that any queued operations are
+  // performed.
+  void FlushAudioLoopForTesting();
+
   bool is_playing_;
 
   // Self-deleting object.
   media::AudioOutputStream* stream_;
 
   scoped_ptr<media::AudioOutputStream> output_stream_for_testing_;
 
   // All fields below here are protected by this lock.
   base::Lock state_lock_;
 
   scoped_refptr<media::AudioBusRefCounted> samples_;
 
   // Index to the frame in the samples that we need to play next.
   int frame_index_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioPlayerImpl);
 };
 
 }  // namespace audio_modem
 
 #endif  // COMPONENTS_AUDIO_MODEM_AUDIO_PLAYER_IMPL_H_