Files.app: Removed the column divider at the next to the checkbox.

This CL added the selector for the column divider at the next to the checkbox in
order to remove it.

BUG=245072
TEST=manually

Review URL: https://chromiumcodereview.appspot.com/15737030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203108 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/resources/file_manager/css/file_manager.css

@@ -1616,6 +1616,10 @@ body[new-ui] .table-header-splitter {
   width: 5px;
 }
 
+body[new-ui] .table-header-splitter:last-child {
+  display: none;
+}
+
 /* Container for a table header. */
 .table-header {
   background-color: #f5f5f5;