Relocate display_manager from ash to ui

ash/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/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 
 assert(use_aura)
@@ skipping 597 matching lines @@
     "display/display_animator_chromeos.cc",
     "display/display_animator_chromeos.h",
     "display/display_change_observer_chromeos.cc",
     "display/display_change_observer_chromeos.h",
     "display/display_color_manager_chromeos.cc",
     "display/display_color_manager_chromeos.h",
     "display/display_configuration_controller.cc",
     "display/display_configuration_controller.h",
     "display/display_error_observer_chromeos.cc",
     "display/display_error_observer_chromeos.h",
-    "display/display_manager.cc",
-    "display/display_manager.h",
     "display/display_pref_util.h",
     "display/display_util.cc",
     "display/display_util.h",
     "display/event_transformation_handler.cc",
     "display/event_transformation_handler.h",
     "display/extended_mouse_warp_controller.cc",
     "display/extended_mouse_warp_controller.h",
     "display/json_converter.cc",
     "display/json_converter.h",
     "display/mirror_window_controller.cc",
@@ skipping 863 matching lines @@
   if (is_win) {
     configs -= [ "//build/config/win:console" ]
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
   if (is_chromeos) {
     deps += [ "//device/bluetooth" ]
   }
 }