Don't double correct for discarded codec delay frames.

media/ffmpeg/ffmpeg_common.h

Index: media/ffmpeg/ffmpeg_common.h
diff --git a/media/ffmpeg/ffmpeg_common.h b/media/ffmpeg/ffmpeg_common.h
index f065a6d85a9eb4929f86f8cca8128286bdbd011a..3813348532f96d30e1fec32cfb68b72ef8802caa 100644
--- a/media/ffmpeg/ffmpeg_common.h
+++ b/media/ffmpeg/ffmpeg_common.h
@@ -94,6 +94,12 @@ void VideoDecoderConfigToAVCodecContext(
     const VideoDecoderConfig& config,
     AVCodecContext* codec_context);
 
+MEDIA_EXPORT void AVCodecContextToAudioDecoderConfig(
+    const AVCodecContext* codec_context,
+    bool is_encrypted,
+    AudioDecoderConfig* config,
+    bool record_stats);
+
 // Converts FFmpeg's channel layout to chrome's ChannelLayout.  |channels| can
 // be used when FFmpeg's channel layout is not informative in order to make a
 // good guess about the plausible channel layout based on number of channels.