DevTools: Restore accidentely deleted CSS selector.
DevTools: Restore accidentely deleted CSS selector.

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/441363002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@179610 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs