fix missing semicolons

IPython/html/static/notebook/js/notificationwidget.js

@@ -45,7 +45,7 b' define(['
         this.element.fadeIn(100);
 
         // reset previous set style
-        this.element.removeClass(),
+        this.element.removeClass();
         this.style();
         if (options.class){
 

IPython/html/static/notebook/less/notificationwidget.less

@@ -17,15 +17,15 b''
 }
 
 .notification_widget.warning {
-    .btn-warning()
+    .btn-warning();
 }
 .notification_widget.success {
-    .btn-success()
+    .btn-success();
 }
 .notification_widget.info {
-    .btn-info()
+    .btn-info();
 }
 .notification_widget.danger {
-    .btn-danger()
+    .btn-danger();
 }