Gardening: fix long-script-content.html for windows platform.

On windows we receive longer script because \r\n

BUG=30536
TBR= vsevik@chromium.org

Review URL: https://codereview.chromium.org/569543002

git-svn-id: svn://svn.chromium.org/blink/trunk@181905 bbb929c8-8fbe-4397-9dbb-9b2b20218538