FLOE-194: Implement match confirmation dialog.

JIRA: http://issues.fluidproject.org/browse/FLOE-194
"UIO" part has been removed from the code. The iframe content area that the click is on to trigger the dialog close is not limited to UIO iframe. It applies to any iframe. So, it should be harmless to use this logic in cases where the page have more than just UIO or not have UIO at all.