Remove libvpx from FFmpeg in favour of ffvp8.

ffmpeg/source/config/Chromium/mac/ia32/config.asm

Index: ffmpeg/source/config/Chromium/mac/ia32/config.asm
diff --git a/ffmpeg/source/config/Chromium/mac/ia32/config.asm b/ffmpeg/source/config/Chromium/mac/ia32/config.asm
index 4045828715c2738eb9080412bf93b60d8b48dcd6..7958122061fef92c1938e97aeea43dc9ba2b38d8 100644
--- a/ffmpeg/source/config/Chromium/mac/ia32/config.asm
+++ b/ffmpeg/source/config/Chromium/mac/ia32/config.asm
@@ -54,7 +54,7 @@
 %define HAVE_YASM
 %define CONFIG_DECODERS
 %define CONFIG_DEMUXERS
-%define CONFIG_ENCODERS
+%define CONFIG_PARSERS
 %define CONFIG_PROTOCOLS
 %define CONFIG_AVCODEC
 %define CONFIG_AVDEVICE
@@ -65,7 +65,7 @@
 %define CONFIG_FFPROBE
 %define CONFIG_FFT
 %define CONFIG_GOLOMB
-%define CONFIG_LIBVPX
+%define CONFIG_H264PRED
 %define CONFIG_MDCT
 %define CONFIG_PIC
 %define CONFIG_RDFT
@@ -75,12 +75,12 @@
 %define CONFIG_AVUTIL
 %define CONFIG_THEORA_DECODER
 %define CONFIG_VP3_DECODER
+%define CONFIG_VP8_DECODER
 %define CONFIG_VORBIS_DECODER
 %define CONFIG_PCM_F32LE_DECODER
 %define CONFIG_PCM_S16LE_DECODER
 %define CONFIG_PCM_U8_DECODER
-%define CONFIG_LIBVPX_DECODER
-%define CONFIG_LIBVPX_ENCODER
+%define CONFIG_VP8_PARSER
 %define CONFIG_MATROSKA_DEMUXER
 %define CONFIG_OGG_DEMUXER
 %define CONFIG_WAV_DEMUXER