Roll FFmpeg for M37.

media/base/media_file_checker.cc

Index: media/base/media_file_checker.cc
diff --git a/media/base/media_file_checker.cc b/media/base/media_file_checker.cc
index 418839d6f1d121268c9c32346d81e60a82aa76e1..4a49ac7c6a29c5c8bed2b8863e0d04ca6c812d4a 100644
--- a/media/base/media_file_checker.cc
+++ b/media/base/media_file_checker.cc
@@ -84,18 +84,20 @@ bool MediaFileChecker::Start(base::TimeDelta check_time) {
       // decoded; otherwise av_free_packet() will corrupt memory.
       AVPacket temp_packet = packet;
       do {
-        avcodec_get_frame_defaults(frame.get());
         result = avcodec_decode_audio4(av_context, frame.get(), &frame_decoded,
                                        &temp_packet);
         if (result < 0)
           break;
+        av_frame_unref(frame.get());
         temp_packet.size -= result;
         temp_packet.data += result;
+        frame_decoded = 0;
       } while (temp_packet.size > 0);
     } else if (av_context->codec_type == AVMEDIA_TYPE_VIDEO) {
-      avcodec_get_frame_defaults(frame.get());
       result = avcodec_decode_video2(av_context, frame.get(), &frame_decoded,
                                      &packet);
+      if (result >= 0 && frame_decoded)
+        av_frame_unref(frame.get());
     }
     av_free_packet(&packet);
   } while (base::TimeTicks::Now() < deadline && read_ok && result >= 0);