chromeos: turn on simplified display management for mash

ash/test/ash_test_base.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/ash_test_base.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/display/extended_mouse_warp_controller.h"
@@ skipping 223 matching lines @@
       ->GetDisplayInfo(id)
       .GetActiveRotation();
 }
 
 // static
 display::Display::Rotation AshTestBase::GetCurrentInternalDisplayRotation() {
   return GetActiveDisplayRotation(display::Display::InternalDisplayId());
 }
 
 void AshTestBase::UpdateDisplay(const std::string& display_specs) {
-  if (Shell::GetAshConfig() == Config::MASH) {
+  if (!Shell::ShouldEnableSimplifiedDisplayManagement()) {
     ash_test_helper_->UpdateDisplayForMash(display_specs);
   } else {
     display::test::DisplayManagerTestApi(Shell::Get()->display_manager())
         .UpdateDisplay(display_specs);
   }
   UnblockCompositors();
 }
 
 aura::Window* AshTestBase::CurrentContext() {
   return ash_test_helper_->CurrentContext();
@@ skipping 248 matching lines @@
   return display::Screen::GetScreen()->GetDisplayNearestWindow(
       Shell::GetPrimaryRootWindow());
 }
 
 display::Display AshTestBase::GetSecondaryDisplay() {
   return ash_test_helper_->GetSecondaryDisplay();
 }
 
 }  // namespace test
 }  // namespace ash