DevTools: add presubmit errors for /deep/ and ::shadow selectors in devtools.
DevTools: add presubmit errors for /deep/ and ::shadow selectors in devtools.

BUG=490953

Review URL: https://codereview.chromium.org/1161653002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@195916 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk