[DevTools] Don't ignore sourceURL in inline scripts

R=vsevik@chromium.org
BUG=358212

Review URL: https://codereview.chromium.org/535183002

git-svn-id: svn://svn.chromium.org/blink/trunk@182578 bbb929c8-8fbe-4397-9dbb-9b2b20218538