Bug 910854 - [Clock] Reduce analog face resizing from 4 sizes to 3 sizes

`clock_view.js`
    - Changed to resize to 3 sizes instead of 4
    - Removed reference to 'marks' CSS
`clock.css`
    - Renamed 'marks' size classes to 'small', 'medium', 'large'
Issues
    - No unit tests for this?  Is there an integration test?