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This change enables AV_EF_EXPLODE such that all serious errors
encountered during demuxing are fatal. Previously ffmpeg would
try to ignore these in some cases; leading to ubsan or other
issues. Specifically crbug.com/698524 and crbug.com/710791.

Due to the removal of the speex parser from ogg, there is one
test that needs updating with the roll too.

https://chromium.googlesource.com/chromium/third_party/ffmpeg.git/+log/1e816bccb5ff..252244150ad7

$ git log 1e816bccb..252244150 --date=short --no-merges --format='%ad %ae %s'
2017-11-17 dalecurtis [mpeg4video] Fix undefined shift on assumed 8-bit input.
2017-11-17 dalecurtis Disable unused ogg codec parsers; they have bugs we don't care about.
2017-11-17 dalecurtis Use ff_thread_once for fixed, float table init.
2017-11-17 dalecurtis Fixup some patches messages.
2017-11-17 dalecurtis [mov] Fix leak of frame_duration_buffer in mov_fix_index().
2017-11-17 dalecurtis Prevent undefined shift with wrap_bits >= 63.
2017-11-15 hubbe avformat/mov: Check size of STSC allocation
2017-11-17 jstebbins [PATCH] lavf/mov: don't read outside frag_index bounds

Created with:
  roll-dep src/third_party/ffmpeg

BUG=786269,782074,783459,784159,654612,779924,710791,698524
TEST=security test cases no longer fail.

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Ibbf3c32080705d6484682351a351663c51a7f752
Reviewed-on: https://chromium-review.googlesource.com/777408
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517709}