Fold {Audio|Video}Decoder::Stop() into the dtor.

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 6d1df7c3c936a6b85fef625f1b1ee4183897e277..70cbc5632268c13130e6e6231bc6901a43b80f69 100644
--- a/media/filters/decrypting_audio_decoder.h
+++ b/media/filters/decrypting_audio_decoder.h
@@ -49,7 +49,6 @@ class MEDIA_EXPORT DecryptingAudioDecoder : public AudioDecoder {
   virtual void Decode(const scoped_refptr<DecoderBuffer>& buffer,
                       const DecodeCB& decode_cb) OVERRIDE;
   virtual void Reset(const base::Closure& closure) OVERRIDE;
-  virtual void Stop() OVERRIDE;
 
  private:
   // For a detailed state diagram please see this link: http://goo.gl/8jAok
@@ -64,7 +63,7 @@ class MEDIA_EXPORT DecryptingAudioDecoder : public AudioDecoder {
     kPendingDecode,
     kWaitingForKey,
     kDecodeFinished,
-    kStopped,
+    kError
   };
 
   // Callback for DecryptorHost::RequestDecryptor().
@@ -101,7 +100,6 @@ class MEDIA_EXPORT DecryptingAudioDecoder : public AudioDecoder {
   OutputCB output_cb_;
   DecodeCB decode_cb_;
   base::Closure reset_cb_;
-  base::Closure stop_cb_;
 
   // The current decoder configuration.
   AudioDecoderConfig config_;