Wire up codec_delay() to MP3StreamParser and FFmpegAudioDecoder.

media/filters/opus_audio_decoder.h

Index: media/filters/opus_audio_decoder.h
diff --git a/media/filters/opus_audio_decoder.h b/media/filters/opus_audio_decoder.h
index 2fad5a8fc4db8d316af6ca3c25ec3106bc596d25..d0dfcf07b3ebdcabae02135d36b5ffcda9ef1e2b 100644
--- a/media/filters/opus_audio_decoder.h
+++ b/media/filters/opus_audio_decoder.h
@@ -66,16 +66,10 @@ class MEDIA_EXPORT OpusAudioDecoder : public AudioDecoder {
   // happens.
   int frames_to_discard_;
 
-  // Number of frames to be discarded at the start of the stream. This value
-  // is typically the CodecDelay value from the container.  This value should
-  // only be applied when input timestamp is |start_input_timestamp_|.
-  int frame_delay_at_start_;
+  // When the input timestamp is |start_input_timestamp_| the decoder needs to
+  // drop |config_.codec_delay()| frames.
   base::TimeDelta start_input_timestamp_;
 
-  // Timestamp to be subtracted from all the frames. This is typically computed
-  // from the CodecDelay value in the container.
-  base::TimeDelta timestamp_offset_;
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(OpusAudioDecoder);
 };