ash: Remove broken display notification suppression when settings is open

ash/test/ash_test_helper.cc

Index: ash/test/ash_test_helper.cc
diff --git a/ash/test/ash_test_helper.cc b/ash/test/ash_test_helper.cc
index 131816e66fae129dcaef98f049e70aa377d668a4..35138448cd542bbb04855ba6ddfd924da2750b65 100644
--- a/ash/test/ash_test_helper.cc
+++ b/ash/test/ash_test_helper.cc
@@ -34,6 +34,7 @@
 #include "ui/wm/core/cursor_manager.h"
 
 #if defined(OS_CHROMEOS)
+#include "ash/system/chromeos/screen_layout_observer.h"
 #include "chromeos/audio/cras_audio_handler.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "device/bluetooth/bluetooth_adapter_factory.h"
@@ -137,6 +138,12 @@ void AshTestHelper::SetUp(bool start_session,
     GetTestSessionStateDelegate()->SetHasActiveUser(true);
   }
 
+#if defined(OS_CHROMEOS)
+  // Tests that change the display configuration generally don't care about the
+  // notifications and the popup UI can interfere with things like cursors.
+  shell->screen_layout_observer()->set_show_notifications_for_testing(false);
+#endif
+
   test::DisplayManagerTestApi(Shell::GetInstance()->display_manager())
       .DisableChangeDisplayUponHostResize();
   ShellTestApi(shell).DisableDisplayAnimator();