Separate ash::test::DisplayManagerTestApi from ash

ash/test/ash_test_helper.cc

 // Copyright 2013 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_helper.h"
 
 #include "ash/accelerators/accelerator_controller_delegate_aura.h"
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/test/material_design_controller_test_api.h"
 #include "ash/common/wm_shell.h"
@@ skipping 119 matching lines @@
   Shell::CreateInstance(init_params);
   aura::test::EnvTestHelper(aura::Env::GetInstance())
       .SetInputStateLookup(std::unique_ptr<aura::InputStateLookup>());
 
   Shell* shell = Shell::GetInstance();
   if (start_session) {
     GetTestSessionStateDelegate()->SetActiveUserSessionStarted(true);
     GetTestSessionStateDelegate()->SetHasActiveUser(true);
   }
 
-  test::DisplayManagerTestApi().DisableChangeDisplayUponHostResize();
+  test::DisplayManagerTestApi(Shell::GetInstance()->display_manager())
+      .DisableChangeDisplayUponHostResize();
   ShellTestApi(shell).DisableDisplayAnimator();
 
   test_screenshot_delegate_ = new TestScreenshotDelegate();
   shell->accelerator_controller_delegate()->SetScreenshotDelegate(
       std::unique_ptr<ScreenshotDelegate>(test_screenshot_delegate_));
 }
 
 void AshTestHelper::TearDown() {
   // Tear down the shell.
   Shell::DeleteInstance();
@@ skipping 57 matching lines @@
 bool AshTestHelper::SupportsMultipleDisplays() {
 #if defined(OS_WIN)
   return false;
 #else
   return true;
 #endif
 }
 
 }  // namespace test
 }  // namespace ash