DevTools: Fix replace bar appearance.

R=eustas@chromium.org, eustas, pfeldman
BUG=348297

Review URL: https://codereview.chromium.org/183803018

git-svn-id: svn://svn.chromium.org/blink/trunk@168389 bbb929c8-8fbe-4397-9dbb-9b2b20218538