Roll FFmpeg DEPS for mp3 and security fixes.
Roll FFmpeg DEPS for mp3 and security fixes.

ffmpeg_revision:
http://src.chromium.org/viewvc/chrome/trunk/deps/third_party/ffmpeg/?view=log

ffmpeg_hash:
http://git.chromium.org/gitweb/?p=chromium/third_party/ffmpeg.git&a=commit

Pulls in the following upstream patches:
c7a9f96 vp8: avoid race condition on segment map.
0781696 threads: fix old frames returned after avcodec_flush_buffers()
7d627c4 mp3_probe: consider id3 tags to be low scoring mp3.

BUG=93932, 110309
TEST=ffmpeg_regression_tests, media_unittests, manual playback.

Review URL: https://chromiumcodereview.appspot.com/9742001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@127759 0039d316-1c4b-4281-b951-d872f2087c98

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