Update ffmpeg binaries directories to support variants based off the target architecture.

BUG=20948
TEST=none

Review URL: http://codereview.chromium.org/215016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@26630 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed