Converts WindowTreeClientTest to be in terms of aura

ui/aura/test/aura_test_base.cc

 // Copyright (c) 2012 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 "ui/aura/test/aura_test_base.h"
 
 #include "ui/aura/client/window_parenting_client.h"
 #include "ui/aura/mus/property_utils.h"
 #include "ui/aura/mus/window_tree_client.h"
 #include "ui/aura/mus/window_tree_host_mus.h"
@@ skipping 129 matching lines @@
 
 ui::mojom::WindowTreeClient* AuraTestBase::window_tree_client() {
   return helper_->window_tree_client();
 }
 
 void AuraTestBase::OnEmbed(
     std::unique_ptr<WindowTreeHostMus> window_tree_host) {}
 
 void AuraTestBase::OnUnembed(Window* root) {}
 
-void AuraTestBase::OnEmbedRootDestroyed(Window* root) {}
+void AuraTestBase::OnEmbedRootDestroyed(WindowTreeHostMus* window_tree_host) {}
 
 void AuraTestBase::OnLostConnection(WindowTreeClient* client) {}
 
 void AuraTestBase::OnPointerEventObserved(const ui::PointerEvent& event,
                                           Window* target) {}
 
 void AuraTestBase::SetWindowManagerClient(WindowManagerClient* client) {}
 
 bool AuraTestBase::OnWmSetBounds(Window* window, gfx::Rect* bounds) {
   return true;
@@ skipping 75 matching lines @@
 
 void AuraTestBaseWithType::SetUp() {
   DCHECK(!setup_called_);
   setup_called_ = true;
   ConfigureBackend(GetParam());
   AuraTestBase::SetUp();
 }
 
 }  // namespace test
 }  // namespace aura