The 'Disconnect Account' overlay for managed accounts needs to be linked to chrome://md-settings/signOut.
This is needed by the MD user menu: when a managed user encounters an unrecoverable error and chooses to sign out to resolve it, the user will be directed to the 'Disconnect Account' dialog to confirm disconnection. See design doc here: https://docs.google.com/document/d/1jEzY44oMWenzJQUIBf1x8dkkqm2PJbYngvQzeXTMkLc/edit#bookmark=id.9a7krxlmbdyu.
Comment 1 by bugdroid1@chromium.org
, Aug 25 2016