chromeos: Remove unused class ash::DisconnectedAppHandler

This was added for mustash, but isn't used anymore.

Bug: none
Change-Id: Ib822df1f0760aa38b038305f5e3f8271b76f976c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209681
Commit-Queue: Scott Violet <sky@chromium.org>
Auto-Submit: James Cook <jamescook@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770783}

ash/BUILD.gn

@@ -260,8 +260,6 @@ component("ash") {
     "detachable_base/detachable_base_notification_controller.h",
     "detachable_base/detachable_base_observer.h",
     "detachable_base/detachable_base_pairing_status.h",
-    "disconnected_app_handler.cc",
-    "disconnected_app_handler.h",
     "display/cros_display_config.cc",
     "display/cros_display_config.h",
     "display/cursor_window_controller.cc",

ash/disconnected_app_handler.cc

-// 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.
-
-#include "ash/disconnected_app_handler.h"
-
-#include "ash/public/cpp/shell_window_ids.h"
-#include "ui/aura/window.h"
-#include "ui/base/class_property.h"
-
-DEFINE_UI_CLASS_PROPERTY_TYPE(ash::DisconnectedAppHandler*)
-
-namespace ash {
-namespace {
-
-DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(DisconnectedAppHandler,
-                                   kDisconnectedAppHandlerKey,
-                                   nullptr)
-
-}  // namespace
-
-// static
-void DisconnectedAppHandler::Create(aura::Window* window) {
-  window->SetProperty(kDisconnectedAppHandlerKey,
-                      new DisconnectedAppHandler(window));
-}
-
-DisconnectedAppHandler::DisconnectedAppHandler(aura::Window* window)
-    : window_(window) {
-  window->AddObserver(this);
-}
-
-DisconnectedAppHandler::~DisconnectedAppHandler() {
-  window_->RemoveObserver(this);
-}
-
-void DisconnectedAppHandler::OnEmbeddedAppDisconnected(aura::Window* window) {
-  delete window_;
-}
-
-}  // namespace ash

ash/disconnected_app_handler.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_DISCONNECTED_APP_HANDLER_H_
-#define ASH_DISCONNECTED_APP_HANDLER_H_
-
-#include "base/macros.h"
-#include "ui/aura/window_observer.h"
-
-namespace ash {
-
-// DisconnectedAppHandler is associated with a single aura Window and deletes
-// the window when the embedded app is disconnected. This is intended to be used
-// for windows created at the request of client apps. This is only used in mash.
-class DisconnectedAppHandler : public aura::WindowObserver {
- public:
-  // Public for WindowProperty.
-  ~DisconnectedAppHandler() override;
-
-  // Creates a new DisconnectedAppHandler associated with |window|.
-  // DisconnectedAppHandler is owned by the window.
-  static void Create(aura::Window* window);
-
- private:
-  explicit DisconnectedAppHandler(aura::Window* root_window);
-
-  // aura::WindowObserver:
-  void OnEmbeddedAppDisconnected(aura::Window* window) override;
-
-  aura::Window* window_;
-
-  DISALLOW_COPY_AND_ASSIGN(DisconnectedAppHandler);
-};
-
-}  // namespace ash
-
-#endif  // ASH_DISCONNECTED_APP_HANDLER_H_