Eliminate WindowTreeConnection

components/mus/public/cpp/tests/test_window_tree_connection_setup.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 "components/mus/public/cpp/tests/test_window_tree_connection_setup.h"
-
-#include "components/mus/public/cpp/lib/window_tree_client_impl.h"
-#include "components/mus/public/cpp/tests/test_window_tree.h"
-#include "components/mus/public/cpp/tests/window_tree_client_impl_private.h"
-
-namespace mus {
-
-TestWindowTreeConnectionSetup::TestWindowTreeConnectionSetup() {}
-
-TestWindowTreeConnectionSetup::~TestWindowTreeConnectionSetup() {
-  std::unique_ptr<WindowTreeConnection> window_tree_client =
-      std::move(window_tree_client_);
-  if (window_tree_client)
-    window_tree_client->RemoveObserver(this);
-}
-
-void TestWindowTreeConnectionSetup::Init(
-    WindowTreeDelegate* window_tree_delegate,
-    WindowManagerDelegate* window_manager_delegate) {
-  window_tree_.reset(new TestWindowTree);
-  window_tree_client_.reset(new WindowTreeClientImpl(
-      window_tree_delegate, window_manager_delegate, nullptr));
-  static_cast<WindowTreeConnection*>(window_tree_client_.get())
-      ->AddObserver(this);
-  WindowTreeClientImplPrivate(window_tree_client_.get())
-      .OnEmbed(window_tree_.get());
-}
-
-WindowTreeConnection* TestWindowTreeConnectionSetup::window_tree_connection() {
-  return window_tree_client_.get();
-}
-
-void TestWindowTreeConnectionSetup::OnWillDestroyConnection(
-    mus::WindowTreeConnection* connection) {
-  // See comment in header as to why we do this.
-  window_tree_client_.release();
-}
-
-}  // namespace mus