Enable display rotation, magnifier in unified desktop mode

ash/test/display_manager_test_api.cc

 // Copyright (c) 2012 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 "ash/test/display_manager_test_api.h"
 
 #include <vector>
 
 #include "ash/display/display_info.h"
 #include "ash/display/display_manager.h"
@@ skipping 131 matching lines @@
   display_manager_->set_change_display_upon_host_resize(false);
 }
 
 void DisplayManagerTestApi::SetAvailableColorProfiles(
     int64 display_id,
     const std::vector<ui::ColorCalibrationProfile>& profiles) {
   display_manager_->display_info_[display_id].set_available_color_profiles(
       profiles);
 }
 
-void DisplayManagerTestApi::SetDefaultMultiDisplayMode(
-    DisplayManager::MultiDisplayMode mode) {
-  display_manager_->default_multi_display_mode_ = mode;
-}
-
 }  // namespace test
 }  // namespace ash