Roll FFmpeg for M37.

media/ffmpeg/ffmpeg_unittest.cc

Index: media/ffmpeg/ffmpeg_unittest.cc
diff --git a/media/ffmpeg/ffmpeg_unittest.cc b/media/ffmpeg/ffmpeg_unittest.cc
index ea1d0e1174c1c391f130b8c85664a9d0752d48e2..dbc28c55a93ab73d9379feb3ed538939d7893eba 100644
--- a/media/ffmpeg/ffmpeg_unittest.cc
+++ b/media/ffmpeg/ffmpeg_unittest.cc
@@ -233,7 +233,7 @@ class FFmpegTest : public testing::TestWithParam<const char*> {
         memcpy(&packet, audio_packets_.peek(), sizeof(packet));
       }
 
-      avcodec_get_frame_defaults(audio_buffer_.get());
+      av_frame_unref(audio_buffer_.get());
       result = avcodec_decode_audio4(av_audio_context(), audio_buffer_.get(),
                                      &got_audio, &packet);
       if (!audio_packets_.empty()) {
@@ -287,7 +287,7 @@ class FFmpegTest : public testing::TestWithParam<const char*> {
         memcpy(&packet, video_packets_.peek(), sizeof(packet));
       }
 
-      avcodec_get_frame_defaults(video_buffer_.get());
+      av_frame_unref(video_buffer_.get());
       av_video_context()->reordered_opaque = packet.pts;
       result = avcodec_decode_video2(av_video_context(), video_buffer_.get(),
                                      &got_picture, &packet);