Revert of Moves ash content specific tests into ash_content_unittests

ash/test/ash_test_environment_content.h

Index: ash/test/ash_test_environment_content.h
diff --git a/ash/test/ash_test_environment_content.h b/ash/test/ash_test_environment_content.h
deleted file mode 100644
index eb6596fbca1bc2aae977c16146a1856423da5415..0000000000000000000000000000000000000000
--- a/ash/test/ash_test_environment_content.h
+++ /dev/null
@@ -1,60 +0,0 @@
-// 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_CONTENT_H_
-#define ASH_TEST_ASH_TEST_ENVIRONMENT_CONTENT_H_
-
-#include "ash/test/ash_test_environment.h"
-#include "base/macros.h"
-
-namespace content {
-class TestBrowserThreadBundle;
-}
-
-namespace ash {
-
-class ShellContentState;
-
-namespace test {
-
-class TestShellContentState;
-
-// AshTestEnvironment implementation for tests that use content.
-class AshTestEnvironmentContent : public AshTestEnvironment {
- public:
-  AshTestEnvironmentContent();
-  ~AshTestEnvironmentContent() override;
-
-  TestShellContentState* test_shell_content_state() {
-    return test_shell_content_state_;
-  }
-  void set_content_state(ShellContentState* content_state) {
-    content_state_ = content_state;
-  }
-
-  // AshTestEnvironment:
-  void SetUp() override;
-  void TearDown() override;
-  base::SequencedWorkerPool* GetBlockingPool() override;
-  std::unique_ptr<views::ViewsDelegate> CreateViewsDelegate() override;
-
- private:
-  std::unique_ptr<content::TestBrowserThreadBundle> thread_bundle_;
-
-  // An implementation of ShellContentState supplied by the user prior to
-  // SetUp().
-  ShellContentState* content_state_ = nullptr;
-
-  // If |content_state_| is not set prior to SetUp(), this value will be
-  // set to an instance of TestShellContentState created by this class. If
-  // |content_state_| is non-null, this will be nullptr.
-  TestShellContentState* test_shell_content_state_ = nullptr;
-
-  DISALLOW_COPY_AND_ASSIGN(AshTestEnvironmentContent);
-};
-
-}  // namespace test
-}  // namespace ash
-
-#endif  // ASH_TEST_ASH_TEST_ENVIRONMENT_CONTENT_H_