Removed custom FFmpegLock. Removed ffmpeg headers from third_party/ffmpeg/include.

third_party/ffmpeg/include/libavutil/adler32.h

Index: third_party/ffmpeg/include/libavutil/adler32.h
diff --git a/third_party/ffmpeg/include/libavutil/adler32.h b/third_party/ffmpeg/include/libavutil/adler32.h
deleted file mode 100644
index 34f2b53e7dab0d7acb9281d757014fad56b6a7ad..0000000000000000000000000000000000000000
--- a/third_party/ffmpeg/include/libavutil/adler32.h
+++ /dev/null
@@ -1,30 +0,0 @@
-/*
- * copyright (c) 2006 Mans Rullgard
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifndef AVUTIL_ADLER32_H
-#define AVUTIL_ADLER32_H
-
-#include <stdint.h>
-#include "common.h"
-
-unsigned long av_adler32_update(unsigned long adler, const uint8_t *buf,
-                                unsigned int len) av_pure;
-
-#endif /* AVUTIL_ADLER32_H */