Clean up potentially leaky use of base::DeletePointer.

media/audio/virtual_audio_input_stream.h

Index: media/audio/virtual_audio_input_stream.h
diff --git a/media/audio/virtual_audio_input_stream.h b/media/audio/virtual_audio_input_stream.h
index d64ef359e96c6cfb5b14576132ffafa25be403d8..bef7fd2f3013128b0b5401f477ba7ccd8b0c9fb0 100644
--- a/media/audio/virtual_audio_input_stream.h
+++ b/media/audio/virtual_audio_input_stream.h
@@ -31,10 +31,6 @@ class VirtualAudioOutputStream;
 // audio until this VirtualAudioInputStream is stopped and closed.
 class MEDIA_EXPORT VirtualAudioInputStream : public AudioInputStream {
  public:
-  // Callback invoked just after VirtualAudioInputStream is closed.
-  typedef base::Callback<void(VirtualAudioInputStream* vais)>
-      AfterCloseCallback;
-
   // Construct a target for audio loopback which mixes multiple data streams
   // into a single stream having the given |params|.  |worker_task_runner| is
   // the task runner on which AudioInputCallback methods are called and may or
@@ -42,7 +38,7 @@ class MEDIA_EXPORT VirtualAudioInputStream : public AudioInputStream {
   VirtualAudioInputStream(
       const AudioParameters& params,
       const scoped_refptr<base::SingleThreadTaskRunner>& worker_task_runner,
-      const AfterCloseCallback& after_close_cb);
+      bool delete_on_close);
 
   ~VirtualAudioInputStream() override;
 
@@ -81,7 +77,7 @@ class MEDIA_EXPORT VirtualAudioInputStream : public AudioInputStream {
 
   const scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner_;
 
-  AfterCloseCallback after_close_cb_;
+  const bool delete_on_close_;
 
   AudioInputCallback* callback_;