Pass task runners to AudioManager constructor.

media/audio/mac/audio_manager_mac.h

Index: media/audio/mac/audio_manager_mac.h
diff --git a/media/audio/mac/audio_manager_mac.h b/media/audio/mac/audio_manager_mac.h
index c1105387763ac51e4c4cdf85327c41d87c3af86f..f8c99e80dfb749c01cd689223c955e02fed2b8ab 100644
--- a/media/audio/mac/audio_manager_mac.h
+++ b/media/audio/mac/audio_manager_mac.h
@@ -26,11 +26,12 @@ class AUHALStream;
 // the AudioManager class.
 class MEDIA_EXPORT AudioManagerMac : public AudioManagerBase {
  public:
-  AudioManagerMac(AudioLogFactory* audio_log_factory);
+  AudioManagerMac(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
+      AudioLogFactory* audio_log_factory);
 
   // Implementation of AudioManager.
-  scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner() override;
-  scoped_refptr<base::SingleThreadTaskRunner> GetWorkerTaskRunner() override;
   bool HasAudioOutputDevices() override;
   bool HasAudioInputDevices() override;
   void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override;
@@ -117,7 +118,6 @@ class MEDIA_EXPORT AudioManagerMac : public AudioManagerBase {
 
  private:
   void InitializeOnAudioThread();
-  void ShutdownOnAudioThread();
 
   int ChooseBufferSize(bool is_input, int sample_rate);
 
@@ -127,9 +127,6 @@ class MEDIA_EXPORT AudioManagerMac : public AudioManagerBase {
 
   scoped_ptr<AudioDeviceListenerMac> output_device_listener_;
 
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  scoped_ptr<base::Thread> worker_thread_;
-
   // Track the output sample-rate and the default output device
   // so we can intelligently handle device notifications only when necessary.
   int current_sample_rate_;
@@ -141,8 +138,11 @@ class MEDIA_EXPORT AudioManagerMac : public AudioManagerBase {
   class AudioPowerObserver;
   scoped_ptr<AudioPowerObserver> power_observer_;
 
-  // Tracks all constructed input and output streams so they can be stopped at
-  // shutdown.  See ShutdownOnAudioThread() for more details.
+  // Tracks all constructed input and output streams.
+  // TODO(alokp): We used to track these streams to close before destruction.

[DaleCurtis, 2016/04/14 00:00:35]

Delete these? You already removed the stop streams code. If you can't remove
them then you can't land this CL as is right? I.e. it would imply that all other
platforms will now have the same issue as OSX.

[alokp, 2016/04/14 13:30:03]

Sorry I do not understand your comment. Remove the TODO or the member variables?
The member variables are still being used by MaybeChangeBufferSize().

+  // We no longer close the streams, so we may be able to get rid of these
+  // member variables. They are currently used by MaybeChangeBufferSize().
+  // Investigate if we can remove these.
   std::list<AudioInputStream*> basic_input_streams_;
   std::list<AUAudioInputStream*> low_latency_input_streams_;
   std::list<AUHALStream*> output_streams_;