Revert of Pass task runners to AudioManager constructor.

media/audio/pulse/audio_manager_pulse.h

Index: media/audio/pulse/audio_manager_pulse.h
diff --git a/media/audio/pulse/audio_manager_pulse.h b/media/audio/pulse/audio_manager_pulse.h
index d2f6450ecb0d86924be0e07a4e33fc0a4d03f38a..93a1c946dd98a33388f366c65a2bb1bbbc727466 100644
--- a/media/audio/pulse/audio_manager_pulse.h
+++ b/media/audio/pulse/audio_manager_pulse.h
@@ -17,12 +17,10 @@
 
 class MEDIA_EXPORT AudioManagerPulse : public AudioManagerBase {
  public:
-  AudioManagerPulse(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
-      AudioLogFactory* audio_log_factory);
+  AudioManagerPulse(AudioLogFactory* audio_log_factory);
+  ~AudioManagerPulse() override;
 
-  bool Init();
+  static AudioManager* Create(AudioLogFactory* audio_log_factory);
 
   // Implementation of AudioManager.
   bool HasAudioOutputDevices() override;
@@ -47,14 +45,12 @@
       const std::string& device_id) override;
 
  protected:
-  ~AudioManagerPulse() override;
-
   AudioParameters GetPreferredOutputStreamParameters(
       const std::string& output_device_id,
       const AudioParameters& input_params) override;
 
  private:
-  bool InitPulse();
+  bool Init();
   void DestroyPulse();
 
   void GetAudioDeviceNames(bool input, media::AudioDeviceNames* device_names);