Re-enable ManuallyCloseMessageCenter in linux aura builds.

Test tuns without errors or warning on my machine.

BUG=163931

Review URL: https://codereview.chromium.org/163433014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251543 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -218,15 +218,8 @@ IN_PROC_BROWSER_TEST_F(WebNotificationTrayTest, MAYBE_ManyPopupNotifications) {
   EXPECT_EQ(kMaxVisiblePopupNotifications, popups.size());
 }
 
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS) && defined(USE_AURA)
-// TODO(erg): linux_aura bringup: http://crbug.com/163931
-#define MAYBE_ManuallyCloseMessageCenter DISABLED_ManuallyCloseMessageCenter
-#else
-#define MAYBE_ManuallyCloseMessageCenter ManuallyCloseMessageCenter
-#endif
-
 IN_PROC_BROWSER_TEST_F(WebNotificationTrayTest,
-                       MAYBE_ManuallyCloseMessageCenter) {
+                       ManuallyCloseMessageCenter) {
   NotificationUIManager* manager = g_browser_process->notification_ui_manager();
   ASSERT_TRUE(manager->DelegatesToMessageCenter());
   MessageCenterNotificationManager* mc_manager =