RefCounted types should not have public destructors, delegate cleanup

media/filters/chunk_demuxer_client.h

 // Copyright (c) 2012 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.
 
 #ifndef MEDIA_FILTERS_CHUNK_DEMUXER_CLIENT_H_
 #define MEDIA_FILTERS_CHUNK_DEMUXER_CLIENT_H_
 
 #include "base/memory/scoped_ptr.h"
 
 namespace media {
 
 class ChunkDemuxer;
 
 // Interface used to notify an external object when a ChunkDemuxer
 // is opened & closed.
 class ChunkDemuxerClient {
  public:
   // Called when a ChunkDemuxer object is opened.
   virtual void DemuxerOpened(ChunkDemuxer* demuxer) = 0;
 
   // The ChunkDemuxer passed via last DemuxerOpened() call is now
   // closed. Any further calls on the demuxer will result in an error.
   virtual void DemuxerClosed() = 0;
 
   // A decryption key associated with |init_data| may be needed to decrypt the
   // media being demuxed before decoding. Note that the demuxing itself does not
   // need decryption.
   virtual void KeyNeeded(scoped_array<uint8> init_data, int init_data_size) = 0;
+
+ protected:
+  virtual ~ChunkDemuxerClient() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_CHUNK_DEMUXER_CLIENT_H_