Remove unused TestTabletMode class

BUG=1113900
R=jamescook@chromium.org

Change-Id: I7e1eb50571f25a5713e4795fa34f3de07b1a3022
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443394
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Auto-Submit: Antonio Gomes (GMT-4) <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#812933}

ash/public/cpp/BUILD.gn

@@ -424,8 +424,6 @@ source_set("test_support") {
     "test/test_new_window_delegate.h",
     "test/test_system_tray_client.cc",
     "test/test_system_tray_client.h",
-    "test/test_tablet_mode.cc",
-    "test/test_tablet_mode.h",
   ]
 
   deps = [

ash/public/cpp/test/test_tablet_mode.cc

-// Copyright 2020 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/public/cpp/test/test_tablet_mode.h"
-
-namespace ash {
-
-TestTabletMode::TestTabletMode() = default;
-TestTabletMode::~TestTabletMode() = default;
-
-void TestTabletMode::AddObserver(TabletModeObserver* observer) {}
-void TestTabletMode::RemoveObserver(TabletModeObserver* observer) {}
-
-bool TestTabletMode::InTabletMode() const {
-  return in_tablet_mode_;
-}
-
-void TestTabletMode::ForceUiTabletModeState(base::Optional<bool> enabled) {}
-
-void TestTabletMode::SetEnabledForTest(bool enabled) {
-  in_tablet_mode_ = enabled;
-}
-
-}  // namespace ash
\ No newline at end of file

ash/public/cpp/test/test_tablet_mode.h

-// Copyright 2020 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_PUBLIC_CPP_TEST_TEST_TABLET_MODE_H_
-#define ASH_PUBLIC_CPP_TEST_TEST_TABLET_MODE_H_
-
-#include "ash/public/cpp/tablet_mode.h"
-
-namespace ash {
-
-// TabletMode implementation for test support.
-class TestTabletMode : public TabletMode {
- public:
-  TestTabletMode();
-  ~TestTabletMode() override;
-
-  // TabletMode:
-  void AddObserver(ash::TabletModeObserver* observer) override;
-  void RemoveObserver(ash::TabletModeObserver* observer) override;
-  bool InTabletMode() const override;
-  void ForceUiTabletModeState(base::Optional<bool> enabled) override;
-  void SetEnabledForTest(bool enabled) override;
-
- private:
-  bool in_tablet_mode_ = false;
-};
-
-}  // namespace ash
-
-#endif  // ASH_PUBLIC_CPP_TEST_TEST_TABLET_MODE_H_
\ No newline at end of file