The Platform method applyBrowserSettings, calls back to Config.java to display success and Error dialogs, causing extra code in COnfig that is generally unneeded except in Java Control Panel.

We can remove the following abstract methods from Config:
setSuccessShownm(), and getSuccessShown(), setApplyButton(), and getApplyButton().
and the following static methods:
showIExplorerErrorDialog(), showMozillaErrorDialog(), showJPISettingsErrorDialog(),
showSuccessDialog(), showJPISettingsSuccessDialog(), and showAlertDialog()
can all be moved inline into the Java Control Panel.

What we need is a return value from applyBrowserSettings to indicate what dialog (if any) to show