Roll FFmpeg for M37.

media/filters/ffmpeg_demuxer.cc

Index: media/filters/ffmpeg_demuxer.cc
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
index 061d631bb67fd25bd795b0e20759a398209ef032..f5b4fddad3b97f03040d8f5f209f940f9d8d3d4c 100644
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -902,15 +902,7 @@ void FFmpegDemuxer::OnReadFrameDone(ScopedAVPacket packet, int result) {
     if (!packet->data) {
       ScopedAVPacket new_packet(new AVPacket());
       av_new_packet(new_packet.get(), 0);
-
-      new_packet->pts = packet->pts;
-      new_packet->dts = packet->dts;
-      new_packet->pos = packet->pos;
-      new_packet->duration = packet->duration;
-      new_packet->convergence_duration = packet->convergence_duration;
-      new_packet->flags = packet->flags;
-      new_packet->stream_index = packet->stream_index;
-
+      av_packet_copy_props(new_packet.get(), packet.get());
       packet.swap(new_packet);
     }