Moving input device hotplug event processing outside of ui/display

ui/display/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")
 
 component("display") {
   sources = [
     "chromeos/display_configurator.cc",
     "chromeos/display_configurator.h",
-    "chromeos/touchscreen_delegate_impl.cc",
-    "chromeos/touchscreen_delegate_impl.h",
     "chromeos/ozone/display_configurator_ozone.cc",
     "chromeos/x11/display_configurator_x11.cc",
     "chromeos/x11/display_mode_x11.cc",
     "chromeos/x11/display_mode_x11.h",
     "chromeos/x11/display_snapshot_x11.cc",
     "chromeos/x11/display_snapshot_x11.h",
     "chromeos/x11/display_util_x11.cc",
     "chromeos/x11/display_util_x11.h",
     "chromeos/x11/native_display_delegate_x11.cc",
     "chromeos/x11/native_display_delegate_x11.h",
@@ skipping 14 matching lines @@
   ]
 
   if (use_x11) {
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xext",
       "//build/config/linux:xi",
       "//build/config/linux:xrandr",
     ]
     deps += [
-      "//ui/events:events_base",
       "//ui/events/platform",
     ]
   }
 
   if (is_chromeos) {
     deps += [ "//ui/display/types" ]
   }
 
   if (use_ozone) {
     deps += [ "//ui/ozone" ]
@@ skipping 16 matching lines @@
   ]
 
   if (is_chromeos) {
     deps += [ "//ui/display/types" ]
   }
 }
 
 test("display_unittests") {
   sources = [
     "chromeos/display_configurator_unittest.cc",
-    "chromeos/touchscreen_delegate_impl_unittest.cc",
     "chromeos/x11/display_util_x11_unittest.cc",
     "chromeos/x11/native_display_event_dispatcher_x11_unittest.cc",
     "util/display_util_unittest.cc",
     "util/edid_parser_unittest.cc",
   ]
 
   deps = [
     "//base/test:run_all_unittests",
     "//testing/gtest",
     "//ui/display/util",
     "//ui/gfx/geometry",
   ]
 
   if (is_chromeos) {
     deps += [
       ":display",
       ":test_util",
       "//ui/display/types",
     ]
   }
 }