Ensures that audio tasks cannot run after AudioManager is deleted.

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 7aa344c3d966b49b356a49b92036e2fb14129866..ec24674e6965b27439b3f824f3c2c26f45ca6a6b 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -26,7 +26,6 @@
 #include "content/public/common/service_info.h"
 #include "content/public/common/socket_permission_request.h"
 #include "content/public/common/window_container_type.mojom.h"
-#include "media/audio/audio_manager.h"
 #include "media/media_features.h"
 #include "media/mojo/interfaces/remoting.mojom.h"
 #include "net/base/mime_util.h"
@@ -62,6 +61,8 @@ class GpuChannelEstablishFactory;
 }
 
 namespace media {
+class AudioLogFactory;
+class AudioManager;
 class CdmFactory;
 }
 
@@ -776,7 +777,7 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Allows the embedder to provide its own AudioManager implementation.
   // If this function returns nullptr, a default platform implementation
   // will be used.
-  virtual media::ScopedAudioManagerPtr CreateAudioManager(
+  virtual std::unique_ptr<media::AudioManager> CreateAudioManager(
       media::AudioLogFactory* audio_log_factory);
   // Creates and returns a factory used for creating CDM instances for playing
   // protected content.