Roll ffmpeg DEPS for security fix.

Roll ffmpeg DEPS for security fix.

Pulls in:
525a71a avcodec/vp8: Do not use num_coeff_partitions in thread/buffer setup

BUG=532967
TEST=ffmpeg_regression_tests
TBR=chcunningham

Committed: https://crrev.com/af0e1b03d563844f7691440bb32fd0d90b60bec6
Cr-Commit-Position: refs/heads/master@{#351889}

[DaleCurtis, 2015-10-01 01:12:38]

dalecurtis@chromium.org changed reviewers:
+ chcunningham@chromium.org, qiangchen@chromium.org

[DaleCurtis, 2015-10-01 01:16:38]

https://chromiumcodereview.appspot.com/1376913003/diff/1/media/filters/video_...
File media/filters/video_cadence_estimator.cc (left):

https://chromiumcodereview.appspot.com/1376913003/diff/1/media/filters/video_...
media/filters/video_cadence_estimator.cc:164: const double drift_ratio =
max_acceptable_drift.InSecondsF() /
Actually, maybe we want std::min(minimum_time_until_max_drift_) here. WDYT
Qiang?

[DaleCurtis, 2015-10-01 19:38:44]

dalecurtis@chromium.org changed reviewers:
- qiangchen@chromium.org

[DaleCurtis, 2015-10-01 19:39:08]

Actually, rolled out the DCHECK change and filed http://crbug.com/538298 since
this needs to land today.

CQ'ing.

[DaleCurtis, 2015-10-01 19:39:11]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2015-10-01 19:39:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1376913003/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1376913003/40001

[commit-bot: I haz the power, 2015-10-01 21:28:32]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-10-01 21:29:30]

Patchset 3 (id:??) landed as
https://crrev.com/af0e1b03d563844f7691440bb32fd0d90b60bec6
Cr-Commit-Position: refs/heads/master@{#351889}