Revert 271945 "Roll FFmpeg for M37."

trunk/src/media/base/media_file_checker.cc

Index: trunk/src/media/base/media_file_checker.cc
===================================================================
--- trunk/src/media/base/media_file_checker.cc	(revision 271953)
+++ trunk/src/media/base/media_file_checker.cc	(working copy)
@@ -84,20 +84,18 @@
       // 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);