Roll ffmpeg/libvpx deps to switch to ffvp8.

BUG=50811
TEST=remoting_unittests, media_unittests, layout tests

Review URL: http://codereview.chromium.org/7657005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97421 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed