Require new audio baseline due to changed V8 behavior

TBR=jochen@chromium.org
BUG=318632

Review URL: https://codereview.chromium.org/71343002

git-svn-id: svn://svn.chromium.org/blink/trunk@161905 bbb929c8-8fbe-4397-9dbb-9b2b20218538