DevTools: Fix broken console search

This regressed in r167903

R=eustas, vsevik
BUG=350845
NOTRY=true

Review URL: https://codereview.chromium.org/194623003

git-svn-id: svn://svn.chromium.org/blink/trunk@168912 bbb929c8-8fbe-4397-9dbb-9b2b20218538