Fixed the Generic popup and SSDatagrid shortcomings

Fixed the Generic popup so that the auto hide is
optional (this includes the glass pane disabling the back)
and also fixed the datagrid to hide the transparent scroller in chrome

# FOR REVIEW
 * Ignore the src/com/google/gwt/user/cellview/client/DataGrid.java class as it is written by GWT (Google) and only one piece of code had reference names added

issue: A24Group/Triage#3829
issue: A24Group/Triage#3766