Changes how window manager obtains WindowTree from mus

components/mus/ws/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/mojo_application_manifest.gni")
 
 source_set("lib") {
@@ skipping 50 matching lines @@
     "user_id.h",
     "user_id_tracker.cc",
     "user_id_tracker.h",
     "user_id_tracker_observer.h",
     "window_coordinate_conversions.cc",
     "window_coordinate_conversions.h",
     "window_finder.cc",
     "window_finder.h",
     "window_manager_access_policy.cc",
     "window_manager_access_policy.h",
-    "window_manager_factory_registry.cc",
-    "window_manager_factory_registry.h",
-    "window_manager_factory_registry_observer.h",
-    "window_manager_factory_service.cc",
-    "window_manager_factory_service.h",
     "window_manager_state.cc",
     "window_manager_state.h",
+    "window_manager_window_tree_factory.cc",
+    "window_manager_window_tree_factory.h",
+    "window_manager_window_tree_factory_set.cc",
+    "window_manager_window_tree_factory_set.h",
+    "window_manager_window_tree_factory_set_observer.h",
     "window_server.cc",
     "window_server.h",
     "window_server_delegate.cc",
     "window_server_delegate.h",
     "window_tree.cc",
     "window_tree.h",
     "window_tree_binding.cc",
     "window_tree_binding.h",
     "window_tree_factory.cc",
     "window_tree_factory.h",
@@ skipping 143 matching lines @@
 
   data_deps = [
     ":mus_ws_unittests_app_manifest",
   ]
 }
 
 mojo_application_manifest("mus_ws_unittests_app_manifest") {
   application_name = "mus_ws_unittests_app"
   source = "mus_ws_unittests_app_manifest.json"
 }