Don't show the "permissions error" page after a user self-removes rights

- Instead show a message saying that it will no longer be able to access this page
- Added a "success=1" parameter to URL the user is redirected to after making changes
  on that page to catch those cases

bug: 48609
Change-Id: I4f42713ccec647b1d6ff11c2714d645973750579
Merge "Don't show the "permissions error" page after a user self-removes rights"