Change line endings of video-with-invalid-source to unix

BUG=345027
R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/203173006

git-svn-id: svn://svn.chromium.org/blink/trunk@169473 bbb929c8-8fbe-4397-9dbb-9b2b20218538