Bug 1442547 - Show site data manager selection in high contrast mode. r=dao

MozReview-Commit-ID: 5JLOIElY8IS

--HG--
extra : rebase_source : 2c55a76a7283878d40ed862120ff66ab100d01a1

browser/themes/shared/incontentprefs/siteDataSettings.css

@@ -9,6 +9,11 @@
   min-height: 20em;
 }
 
+/* Show selected items in high contrast mode. */
+#sitesList > richlistitem[selected] {
+  outline: 1px solid transparent;
+}
+
 #sitesList > richlistitem > hbox,
 .item-box > label {
   -moz-box-flex: 1;