Reland: Pass task runners to AudioManager constructor.

media/audio/fake_audio_manager.h

Index: media/audio/fake_audio_manager.h
diff --git a/media/audio/fake_audio_manager.h b/media/audio/fake_audio_manager.h
index ee055c79033b10a9fa07a00b1f45bfbf2d83c2f0..326988c9879a239f6b96e3da3c5e0df17fb1d7f8 100644
--- a/media/audio/fake_audio_manager.h
+++ b/media/audio/fake_audio_manager.h
@@ -16,7 +16,10 @@ namespace media {
 
 class MEDIA_EXPORT FakeAudioManager : public AudioManagerBase {
  public:
-  FakeAudioManager(AudioLogFactory* audio_log_factory);
+  FakeAudioManager(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
+      AudioLogFactory* audio_log_factory);
 
   // Implementation of AudioManager.
   bool HasAudioOutputDevices() override;