Revert of Pass task runners to AudioManager constructor.

media/audio/audio_manager_factory.h

Index: media/audio/audio_manager_factory.h
diff --git a/media/audio/audio_manager_factory.h b/media/audio/audio_manager_factory.h
index 72501486d1af6bcac315d17dd40ead559859268b..11f1338d0ba596d9af6817ed1b1f2e8bbc955929 100644
--- a/media/audio/audio_manager_factory.h
+++ b/media/audio/audio_manager_factory.h
@@ -5,18 +5,11 @@
 #ifndef MEDIA_AUDIO_AUDIO_MANAGER_FACTORY_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_FACTORY_H_
 
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
-
-namespace base {
-class SingleThreadTaskRunner;
-}  // namespace base
 
 namespace media {
 
 class AudioManager;
-class AudioManagerDeleter;
 class AudioLogFactory;
 
 // Allows a platform-specific implementation of AudioManager to be provided in
@@ -27,10 +20,7 @@
 
   // Creates an instance of AudioManager implementation. Caller owns the
   // returned instance. |audio_log_factory| must outlive the returned instance.
-  virtual scoped_ptr<AudioManager, AudioManagerDeleter> CreateInstance(
-      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-      scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
-      AudioLogFactory* audio_log_factory) = 0;
+  virtual AudioManager* CreateInstance(AudioLogFactory* audio_log_factory) = 0;
 };
 
 }  // namespace media