[New Multicolumn] Remove unnecessary calls to setRegionBasedColumnsEnabled.

LayoutTests/fast/multicol/balance-trailing-border2.html

Index: LayoutTests/fast/multicol/balance-trailing-border2.html
diff --git a/LayoutTests/fast/multicol/balance-trailing-border2.html b/LayoutTests/fast/multicol/balance-trailing-border2.html
index a0ee6f9b791bbfde315ba421f0cf515932931429..1f815e9afc40294470e788bb4c476c35e81c29f7 100644
--- a/LayoutTests/fast/multicol/balance-trailing-border2.html
+++ b/LayoutTests/fast/multicol/balance-trailing-border2.html
@@ -2,8 +2,6 @@
 <script src="../../resources/js-test.js"></script>
 <script>
     description("Tests that the bottom border at a column boundary in a block that lives in multiple columns is recorded properly for balancing");
-    if (window.internals)
-        internals.settings.setRegionBasedColumnsEnabled(true);
 </script>
 <p>There should be no space between the short black line and the long gray one.</p>
 <div id="mc" style="-webkit-columns:3; columns:3; line-height:21px; orphans:1; widows:1; border-bottom:3px solid gray;">