mash: Move directly linked NewWindowDelegate to mojom::NewWindowClient.

ash/mus/BUILD.gn

 # Copyright 2015 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("//mojo/public/tools/bindings/mojom.gni")
 import("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 import("//tools/grit/repack.gni")
 
@@ skipping 39 matching lines @@
     "frame/detached_title_area_renderer.h",
     "frame/detached_title_area_renderer_host.h",
     "keyboard_ui_mus.cc",
     "keyboard_ui_mus.h",
     "layout_manager.cc",
     "layout_manager.h",
     "move_event_handler.cc",
     "move_event_handler.h",
     "native_widget_factory_mus.cc",
     "native_widget_factory_mus.h",
-    "new_window_delegate_mus.cc",
-    "new_window_delegate_mus.h",
     "non_client_frame_controller.cc",
     "non_client_frame_controller.h",
     "property_util.cc",
     "property_util.h",
     "root_window_controller.cc",
     "root_window_controller.h",
     "screenlock_layout.cc",
     "screenlock_layout.h",
     "shadow.cc",
     "shadow.h",
@@ skipping 213 matching lines @@
     "//ui/views/mus",
   ]
 
   data_deps = [
     ":mus",
     "//mash/quick_launch",
   ]
 
   defines = [ "NOTIMPLEMENTED_POLICY=5" ]
 }