Enable display rotation, magnifier in unified desktop mode

ash/test/display_manager_test_api.cc

Index: ash/test/display_manager_test_api.cc
diff --git a/ash/test/display_manager_test_api.cc b/ash/test/display_manager_test_api.cc
index 2d208273526f0440cfdb45caf781aad0843484c1..b2c169021512bb96dcf9e279c0695da4acd97e51 100644
--- a/ash/test/display_manager_test_api.cc
+++ b/ash/test/display_manager_test_api.cc
@@ -149,10 +149,5 @@ void DisplayManagerTestApi::SetAvailableColorProfiles(
       profiles);
 }
 
-void DisplayManagerTestApi::SetDefaultMultiDisplayMode(
-    DisplayManager::MultiDisplayMode mode) {
-  display_manager_->default_multi_display_mode_ = mode;
-}
-
 }  // namespace test
 }  // namespace ash