Regression: Fix option styles for listbox applied to menulist options

The :checked style for listbox options shouldn't be applied to menulist options.

BUG=395969

Review URL: https://codereview.chromium.org/405393002

git-svn-id: svn://svn.chromium.org/blink/trunk@178746 bbb929c8-8fbe-4397-9dbb-9b2b20218538