Reland: Pass task runners to AudioManager constructor.

chromecast/media/audio/cast_audio_manager_factory.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromecast/media/audio/cast_audio_manager_factory.h"
 
 #include "chromecast/media/audio/cast_audio_manager.h"
 #include "chromecast/media/cma/backend/media_pipeline_backend_manager.h"
 
 namespace chromecast {
 namespace media {
 
 CastAudioManagerFactory::CastAudioManagerFactory(
     MediaPipelineBackendManager* backend_manager)
     : backend_manager_(backend_manager) {
 }
 
 CastAudioManagerFactory::~CastAudioManagerFactory() {}
 
-::media::AudioManager* CastAudioManagerFactory::CreateInstance(
+scoped_ptr<::media::AudioManager, ::media::AudioManagerDeleter>
+CastAudioManagerFactory::CreateInstance(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
     ::media::AudioLogFactory* audio_log_factory) {
-  return new CastAudioManager(audio_log_factory, backend_manager_);
+  return scoped_ptr<::media::AudioManager, ::media::AudioManagerDeleter>(
+      new CastAudioManager(std::move(task_runner),
+                           std::move(worker_task_runner), audio_log_factory,
+                           backend_manager_));
 }
 
 }  // namespace media
 }  // namespace chromecast