jquery.ui.theme.css: Visible links in dialogs

Test case:
$('<div>Examples: <a href="//example.com/foo">unvisited link</a>, <a href="//www.mediawiki.org/">visited link</a></div>').dialog({title:'Examples: <a href="//example.com/foo">unvisited link</a>, <a href="//www.mediawiki.org/">visited link</a>'})

Bug: 67851
Change-Id: I2280c87beb423d8b0ec53ffac53cd4cc5577a53c