Bug 214621 [Viewers] Make ComboViewer non-final
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ComboViewer.java
* @param style the SWT style bits
     */
    public ComboViewer(Composite parent, int style) {
        this(new Combo(parent, style));
    }
    /**
     * Creates a combo viewer on the given combo control.
     * The viewer has no input, no content provider, a default label provider, 
     * no sorter, and no filters.
     *
     * @param list the combo control
     */
    public ComboViewer(Combo list) {
        this.combo = list;
        hookControl(list);
    }
    
    /**
     * Creates a combo viewer on the given CCombo control.
     * The viewer has no input, no content provider, a default label provider, 
     * no sorter, and no filters.
     *
     * @param list the CCombo control
     * @since 3.3
     */
    public ComboViewer(CCombo list) {
        this.ccombo = list;
        hookControl(list);
    }
    protected void listAdd(String string, int index) {