Encrypted Media: Support Audio Decrypt-Only.

media/filters/decrypting_demuxer_stream.h

Index: media/filters/decrypting_demuxer_stream.h
diff --git a/media/filters/decrypting_demuxer_stream.h b/media/filters/decrypting_demuxer_stream.h
index bb86dec36e553e4923481cfc37263aaf7078c102..a6a047c72fe4d445aeaa6cd491ec0cbb9232d768 100644
--- a/media/filters/decrypting_demuxer_stream.h
+++ b/media/filters/decrypting_demuxer_stream.h
@@ -24,19 +24,6 @@ class DecoderBuffer;
 // that no locks are required for thread safety.
 class MEDIA_EXPORT DecryptingDemuxerStream : public DemuxerStream {
  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;
-
   DecryptingDemuxerStream(
       const scoped_refptr<base::MessageLoopProxy>& message_loop,
       const RequestDecryptorNotificationCB& request_decryptor_notification_cb);