Index: wp-includes/css/admin-bar.dev.css
===================================================================
--- wp-includes/css/admin-bar.dev.css	(revision 17040)
+++ wp-includes/css/admin-bar.dev.css	(working copy)
@@ -16,6 +16,11 @@
 	min-width: 960px;
 }
 
+#wpadminbar :before, #wpadminbar :after {
+	content: "";
+	content: none;
+}
+
 #wpadminbar a,
 #wpadminbar a:hover {
 	outline: none;