Bug 1028528 - Override the dropOn text color on Win Vista+ default theme. r=Gavin

--HG--
extra : rebase_source : 79c927041b18ec1fdb20ebca88d31404f06d7fb9

toolkit/themes/windows/global/tree.css

@@ -519,6 +519,10 @@ treechildren::-moz-tree-cell-text(selected, editing) {
       border-radius: 0;
     }
 
+    treechildren::-moz-tree-cell-text(primary, dropOn) {
+      color: -moz-FieldText;
+    }
+
     treechildren:not(.autocomplete-treebody)::-moz-tree-cell-text {
       padding-bottom: initial;
       border-color: transparent;