Revert removal of carriage returns from newlines.vtt

R=acolwell@chromium.org
BUG=353373

Review URL: https://codereview.chromium.org/220183002

git-svn-id: svn://svn.chromium.org/blink/trunk@170583 bbb929c8-8fbe-4397-9dbb-9b2b20218538