Ensures that audio tasks cannot run after AudioManager is deleted.

chromecast/browser/cast_content_browser_client.h

Index: chromecast/browser/cast_content_browser_client.h
diff --git a/chromecast/browser/cast_content_browser_client.h b/chromecast/browser/cast_content_browser_client.h
index 200ad6d78d4348723b674571f69bc8850ca5460f..1bac58c29e99f0c21d072af95c2f351182d48d98 100644
--- a/chromecast/browser/cast_content_browser_client.h
+++ b/chromecast/browser/cast_content_browser_client.h
@@ -100,7 +100,9 @@ class CastContentBrowserClient : public content::ContentBrowserClient {
 
   media::MediaPipelineBackendManager* media_pipeline_backend_manager();
 
-  ::media::ScopedAudioManagerPtr CreateAudioManager(
+  std::unique_ptr<::media::AudioManager> CreateAudioManager(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
       ::media::AudioLogFactory* audio_log_factory) override;
   std::unique_ptr<::media::CdmFactory> CreateCdmFactory() override;
 #endif  // BUILDFLAG(IS_CAST_USING_CMA_BACKEND)