Revert of Add Stop() to AudioDecoder.

media/filters/decrypting_audio_decoder.h

Index: media/filters/decrypting_audio_decoder.h
diff --git a/media/filters/decrypting_audio_decoder.h b/media/filters/decrypting_audio_decoder.h
index 5d9c4da243580620650c3a5083a8d6dcc64b1eef..968d4c4e115b7b9efb606d0503cd9bf88ad812d3 100644
--- a/media/filters/decrypting_audio_decoder.h
+++ b/media/filters/decrypting_audio_decoder.h
@@ -48,7 +48,6 @@
                           const StatisticsCB& statistics_cb) OVERRIDE;
   virtual void Read(const ReadCB& read_cb) OVERRIDE;
   virtual void Reset(const base::Closure& closure) OVERRIDE;
-  virtual void Stop(const base::Closure& closure) OVERRIDE;
   virtual int bits_per_channel() OVERRIDE;
   virtual ChannelLayout channel_layout() OVERRIDE;
   virtual int samples_per_second() OVERRIDE;
@@ -68,7 +67,6 @@
     kPendingDecode,
     kWaitingForKey,
     kDecodeFinished,
-    kStopped,
   };
 
   // Callback for DecryptorHost::RequestDecryptor().
@@ -117,7 +115,6 @@
   StatisticsCB statistics_cb_;
   ReadCB read_cb_;
   base::Closure reset_cb_;
-  base::Closure stop_cb_;
 
   // Pointer to the demuxer stream that will feed us compressed buffers.
   DemuxerStream* demuxer_stream_;