DevTools: do not recognize inline sourceURL, require it to end with the crlf.

BUG=366595
R=vsevik@chromium.org

Review URL: https://codereview.chromium.org/256543002

git-svn-id: svn://svn.chromium.org/blink/trunk@172522 bbb929c8-8fbe-4397-9dbb-9b2b20218538