media: Allow config change between clear and encrypted streams

media/filters/decoder_stream.h

Index: media/filters/decoder_stream.h
diff --git a/media/filters/decoder_stream.h b/media/filters/decoder_stream.h
index cf9dcd91ae756983d1d2c030222a3c7fc7028dcd..0056269389290bcec15ae01cfe81af0cf3e59bb5 100644
--- a/media/filters/decoder_stream.h
+++ b/media/filters/decoder_stream.h
@@ -205,12 +205,14 @@ class MEDIA_EXPORT DecoderStream {
   std::unique_ptr<DecoderSelector<StreamType>> decoder_selector_;
 
   std::unique_ptr<Decoder> decoder_;
+
   // When falling back from H/W decoding to S/W decoding, destructing the
   // GpuVideoDecoder too early results in black frames being displayed.
   // |previous_decoder_| is used to keep it alive.  It is destroyed once we've
   // decoded at least media::limits::kMaxVideoFrames frames after fallback.
   int decoded_frames_since_fallback_;
   std::unique_ptr<Decoder> previous_decoder_;
+
   std::unique_ptr<DecryptingDemuxerStream> decrypting_demuxer_stream_;
 
   ConfigChangeObserverCB config_change_observer_cb_;