Re-enable WebNotifications test for linux aura.

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

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/message_center/web_notification_tray.h"
 
 #include <set>
 
 #include "ash/root_window_controller.h"
 #include "ash/system/status_area_widget.h"
@@ skipping 85 matching lines @@
     g_browser_process->notification_ui_manager()->CancelById(id);
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebNotificationTrayTest);
 };
 
 }  // 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();
 
   // Add a notification.
   AddNotification("test_id1", "replace_id1");
   EXPECT_EQ(1u, message_center->NotificationCount());
   EXPECT_TRUE(message_center->HasNotification("test_id1"));
   EXPECT_FALSE(message_center->HasNotification("test_id2"));
   AddNotification("test_id2", "replace_id2");
   AddNotification("test_id2", "replace_id2");
@@ skipping 118 matching lines @@
   EXPECT_TRUE(message_center->IsMessageCenterVisible());
 
   mc_manager->EnsureMessageCenterClosed();
 
   EXPECT_FALSE(message_center->IsMessageCenterVisible());
   if (NULL != tray->message_center_delegate_)
     EXPECT_TRUE(tray->message_center_delegate_->GetWidget()->IsClosed());
 }
 
 }  // namespace message_center