Converts WindowTreeClientTest to be in terms of aura

services/ui/demo/mus_demo.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 "services/ui/demo/mus_demo.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/time/time.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/public/cpp/service_context.h"
@@ skipping 91 matching lines @@
 void MusDemo::OnEmbed(
     std::unique_ptr<aura::WindowTreeHostMus> window_tree_host) {
   // Not called for the WindowManager.
   NOTREACHED();
 }
 
 void MusDemo::OnUnembed(aura::Window* root) {
   NOTREACHED();
 }
 
-void MusDemo::OnEmbedRootDestroyed(aura::Window* root) {
+void MusDemo::OnEmbedRootDestroyed(aura::WindowTreeHostMus* window_tree_host) {
   // Not called for the WindowManager.
   NOTREACHED();
 }
 
 void MusDemo::OnLostConnection(aura::WindowTreeClient* client) {
   root_window_ = nullptr;
   window_tree_client_.reset();
   timer_.Stop();
 }
 
@@ skipping 119 matching lines @@
   gfx::ImageSkiaRep image_skia_rep(bitmap_, 1);
   gfx::ImageSkia image_skia(image_skia_rep);
   gfx::Image image(image_skia);
 
   window_delegate_->SetImage(image);
   bitmap_window_->SchedulePaintInRect(bitmap_window_->bounds());
 }
 
 }  // namespace demo
 }  // namespace aura