Remove use of CoreAudioUtil::IsSupported() from AudioManager startup.

media/audio/win/audio_manager_win.h

Index: media/audio/win/audio_manager_win.h
diff --git a/media/audio/win/audio_manager_win.h b/media/audio/win/audio_manager_win.h
index 01044da40a04b6edd789722aed7949bcf0e2973b..c2ac8d7a1c8bbebfab45a864f885c899a0bc1893 100644
--- a/media/audio/win/audio_manager_win.h
+++ b/media/audio/win/audio_manager_win.h
@@ -79,9 +79,10 @@ class MEDIA_EXPORT AudioManagerWin : public AudioManagerBase {
       const AudioParameters& params,
       const std::string& device_id);
 
-  // Helper methods for constructing AudioDeviceListenerWin on the audio thread.
-  void CreateDeviceListener();
-  void DestroyDeviceListener();
+  // Helper methods for performing expensive initialization tasks on the audio
+  // thread instead of on the UI thread which AudioManager is constructed on.
+  void InitializeOnAudioThread();
+  void ShutdownOnAudioThread();
 
   void GetAudioDeviceNamesImpl(bool input, AudioDeviceNames* device_names);