Roll FFmpeg for M37.

media/cast/test/sender.cc

Index: media/cast/test/sender.cc
diff --git a/media/cast/test/sender.cc b/media/cast/test/sender.cc
index 9dd3581e30dfe6740495366983e41f19b45e699e..a7260db6ab3ad9c8b1b29a98e8d2bf2e98607310 100644
--- a/media/cast/test/sender.cc
+++ b/media/cast/test/sender.cc
@@ -140,7 +140,7 @@ VideoSenderConfig GetVideoSenderConfig() {
   return video_config;
 }
 
-void AVFreeFrame(AVFrame* frame) { avcodec_free_frame(&frame); }
+void AVFreeFrame(AVFrame* frame) { av_frame_free(&frame); }
 
 class SendProcess {
  public:
@@ -578,7 +578,7 @@ class SendProcess {
               base::TimeDelta::FromMilliseconds(avframe->pkt_pts));
       audio_algo_.EnqueueBuffer(buffer);
     } while (packet_temp.size > 0);
-    avcodec_free_frame(&avframe);
+    av_frame_free(&avframe);
 
     const int frames_needed_to_scale =
         playback_rate_ * av_audio_context()->sample_rate /