Remove dependency on SurfaceManager in FrameGenerator

services/ui/ws/window_tree_host_factory.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/ws/window_tree_host_factory.h"
 
-#include "services/ui/surfaces/display_compositor.h"
 #include "services/ui/ws/display.h"
 #include "services/ui/ws/display_binding.h"
 #include "services/ui/ws/window_server.h"
 
 namespace ui {
 namespace ws {
 
 WindowTreeHostFactory::WindowTreeHostFactory(WindowServer* window_server,
                                              const UserId& user_id)
     : window_server_(window_server), user_id_(user_id) {
   platform_display_init_params_.metrics.bounds.set_width(1024);
   platform_display_init_params_.metrics.bounds.set_height(768);
   platform_display_init_params_.metrics.pixel_size.SetSize(1024, 768);
   platform_display_init_params_.metrics.device_scale_factor = 1.0f;
-  platform_display_init_params_.display_compositor =
-      window_server_->GetDisplayCompositor();
 }
 
 WindowTreeHostFactory::~WindowTreeHostFactory() {}
 
 void WindowTreeHostFactory::AddBinding(
     mojom::WindowTreeHostFactoryRequest request) {
   bindings_.AddBinding(this, std::move(request));
 }
 
 void WindowTreeHostFactory::CreateWindowTreeHost(
     mojom::WindowTreeHostRequest host,
     mojom::WindowTreeClientPtr tree_client) {
   Display* display = new Display(window_server_, platform_display_init_params_);
   std::unique_ptr<DisplayBindingImpl> display_binding(
       new DisplayBindingImpl(std::move(host), display, user_id_,
                              std::move(tree_client), window_server_));
   display->Init(std::move(display_binding));
 }
 
 }  // namespace ws
 }  // namespace ui