Revert 271945 "Roll FFmpeg for M37."

trunk/src/media/ffmpeg/ffmpeg_unittest.cc

Index: trunk/src/media/ffmpeg/ffmpeg_unittest.cc
===================================================================
--- trunk/src/media/ffmpeg/ffmpeg_unittest.cc	(revision 271953)
+++ trunk/src/media/ffmpeg/ffmpeg_unittest.cc	(working copy)
@@ -233,7 +233,7 @@
         memcpy(&packet, audio_packets_.peek(), sizeof(packet));
       }
 
-      av_frame_unref(audio_buffer_.get());
+      avcodec_get_frame_defaults(audio_buffer_.get());
       result = avcodec_decode_audio4(av_audio_context(), audio_buffer_.get(),
                                      &got_audio, &packet);
       if (!audio_packets_.empty()) {
@@ -287,7 +287,7 @@
         memcpy(&packet, video_packets_.peek(), sizeof(packet));
       }
 
-      av_frame_unref(video_buffer_.get());
+      avcodec_get_frame_defaults(video_buffer_.get());
       av_video_context()->reordered_opaque = packet.pts;
       result = avcodec_decode_video2(av_video_context(), video_buffer_.get(),
                                      &got_picture, &packet);