Privatize StrongBinding lifetime management

services/ui/ws/window_tree_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_factory.h"
 
 #include "base/memory/ptr_util.h"
 #include "services/ui/ws/default_access_policy.h"
 #include "services/ui/ws/window_server.h"
 #include "services/ui/ws/window_tree.h"
 #include "services/ui/ws/window_tree_binding.h"
 
 namespace ui {
 namespace ws {
 
 WindowTreeFactory::WindowTreeFactory(WindowServer* window_server,
                                      const UserId& user_id,
-                                     const std::string& client_name,
-                                     mojom::WindowTreeFactoryRequest request)
+                                     const std::string& client_name)
     : window_server_(window_server),
       user_id_(user_id),
-      client_name_(client_name),
-      binding_(this, std::move(request)) {}
+      client_name_(client_name) {}
 
 WindowTreeFactory::~WindowTreeFactory() {}
 
 void WindowTreeFactory::CreateWindowTree(
     mojo::InterfaceRequest<mojom::WindowTree> tree_request,
     mojom::WindowTreeClientPtr client) {
   std::unique_ptr<ws::WindowTree> service(
       new ws::WindowTree(window_server_, user_id_, nullptr,
                          base::WrapUnique(new DefaultAccessPolicy)));
   std::unique_ptr<ws::DefaultWindowTreeBinding> binding(
       new ws::DefaultWindowTreeBinding(service.get(), window_server_,
                                        std::move(tree_request),
                                        std::move(client)));
   service->set_name(client_name_);
   window_server_->AddTree(std::move(service), std::move(binding), nullptr);
 }
 
 }  // namespace ws
 }  // namespace ui