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

third_party/ffmpeg/include/libavutil/sha1.h

Index: third_party/ffmpeg/include/libavutil/sha1.h
diff --git a/third_party/ffmpeg/include/libavutil/sha1.h b/third_party/ffmpeg/include/libavutil/sha1.h
deleted file mode 100644
index 0f14ca8960ae49d8f216b12b3b3128c659e831e8..0000000000000000000000000000000000000000
--- a/third_party/ffmpeg/include/libavutil/sha1.h
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
- *
- * 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_SHA1_H
-#define AVUTIL_SHA1_H
-
-#include <stdint.h>
-
-extern const int av_sha1_size;
-
-struct AVSHA1;
-
-void av_sha1_init(struct AVSHA1* context);
-void av_sha1_update(struct AVSHA1* context, const uint8_t* data, unsigned int len);
-void av_sha1_final(struct AVSHA1* context, uint8_t digest[20]);
-
-#endif /* AVUTIL_SHA1_H */