Rebase WebAudio codec tests on linux after ffmpeg update.

BUG=
R=dalecurtis@chromium.org
TBR=dalecurtis@chromium.org

I verified that the difference between the two version differ by at most 1 lsb, so the update just introduced very minor differences.

Review URL: https://codereview.chromium.org/65503002

git-svn-id: svn://svn.chromium.org/blink/trunk@161567 bbb929c8-8fbe-4397-9dbb-9b2b20218538