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)
@@ -33,6 +33,10 @@
 	z-index: 99999;
 }
 
+#wpadminbar ul li:before {
+	content: none;
+}
+
 #wpadminbar .quicklinks ul {
 	text-align: left;
 }