Re-enable WebNotifications test for linux aura.

chrome/browser/ui/views/message_center/web_notification_tray_browsertest.cc

Index: chrome/browser/ui/views/message_center/web_notification_tray_browsertest.cc
diff --git a/chrome/browser/ui/views/message_center/web_notification_tray_browsertest.cc b/chrome/browser/ui/views/message_center/web_notification_tray_browsertest.cc
index c4ea34dbb9959914683401d705f3a2495085e05a..4e696b1c589962166579aa061e6e1f8293fdd298 100644
--- a/chrome/browser/ui/views/message_center/web_notification_tray_browsertest.cc
+++ b/chrome/browser/ui/views/message_center/web_notification_tray_browsertest.cc
@@ -103,15 +103,8 @@ class WebNotificationTrayTest : public InProcessBrowserTest {
 }  // namespace
 
 
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(USE_AURA)
-// TODO(erg): linux_aura bringup: http://crbug.com/163931
-#define MAYBE_WebNotifications DISABLED_WebNotifications
-#else
-#define MAYBE_WebNotifications WebNotifications
-#endif
-
 // TODO(dewittj): More exhaustive testing.
-IN_PROC_BROWSER_TEST_F(WebNotificationTrayTest, MAYBE_WebNotifications) {
+IN_PROC_BROWSER_TEST_F(WebNotificationTrayTest, WebNotifications) {
   message_center::MessageCenter* message_center =
       message_center::MessageCenter::Get();