Encrypted Media: Support Audio Decrypt-Only.

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 40995a46353d43374ece2d89ba08dfc50fd97f56..a0032af261cd1076b17852b43dfdf23371ee34d1 100644
--- a/media/filters/decrypting_audio_decoder.h
+++ b/media/filters/decrypting_audio_decoder.h
@@ -31,18 +31,6 @@ class Decryptor;
 // DecryptingAudioDecoder for audio decoding.
 class MEDIA_EXPORT DecryptingAudioDecoder : public AudioDecoder {
  public:
-  // Callback to notify decryptor creation.
-  typedef base::Callback<void(Decryptor*)> DecryptorNotificationCB;
-  // Callback to request/cancel decryptor creation notification.
-  // Calling this callback with a non-null callback registers decryptor creation
-  // notification. When the decryptor is created, notification will be sent
-  // through the provided callback.
-  // Calling this callback with a null callback cancels previously registered
-  // decryptor creation notification. Any previously provided callback will be
-  // fired immediately with NULL.
-  typedef base::Callback<void(const DecryptorNotificationCB&)>
-      RequestDecryptorNotificationCB;
-
   DecryptingAudioDecoder(
       const scoped_refptr<base::MessageLoopProxy>& message_loop,
       const RequestDecryptorNotificationCB& request_decryptor_notification_cb);