Revert of Moves ash content specific tests into ash_content_unittests

ash/test/ash_test_environment.h

-// Copyright 2016 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.
-
-#ifndef ASH_TEST_ASH_TEST_ENVIRONMENT_H_
-#define ASH_TEST_ASH_TEST_ENVIRONMENT_H_
-
-#include <memory>
-
-namespace base {
-class SequencedWorkerPool;
-}
-
-namespace views {
-class ViewsDelegate;
-}
-
-namespace ash {
-namespace test {
-
-// AshTestEnvironment creates objects specific to an environment. Two
-// environments are provided, one for content (AshTestEnvironmentContent)
-// and one without content (AshTestEnvironmentDefault).
-//
-// AshTestBase creates an AshTestEnvironment by way of
-// AshTestEnvironment::Create(). The implementation of Create() depends upon
-// the ash target that was linked against: //ash:test_support_with_content
-// includes AshTestEnvironmentContent and //ash:test_support_without_content
-// includes AshTestEnvironmentDefault.
-class AshTestEnvironment {
- public:
-  virtual ~AshTestEnvironment() {}
-
-  // Creates the object appropriate to the current environment.
-  static std::unique_ptr<AshTestEnvironment> Create();
-
-  // Called from AshTestHelper::SetUp()/TearDown().
-  virtual void SetUp() {}
-  virtual void TearDown() {}
-
-  virtual base::SequencedWorkerPool* GetBlockingPool() = 0;
-
-  virtual std::unique_ptr<views::ViewsDelegate> CreateViewsDelegate() = 0;
-
- protected:
-  AshTestEnvironment() {}
-};
-
-}  // namespace test
-}  // namespace ash
-
-#endif  // ASH_TEST_ASH_TEST_ENVIRONMENT_H_