This change removed a duplicate style found in elementsPanel.css

BUG=330537
R=pfeldman@chromium.org

Review URL: https://codereview.chromium.org/120763002

git-svn-id: svn://svn.chromium.org/blink/trunk@164301 bbb929c8-8fbe-4397-9dbb-9b2b20218538