Revise ui::DomKey to unify character and non-character codes.

ui/events/ozone/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/linux/pkg_config.gni")
 import("//build/config/ui.gni")
 
 declare_args() {
   # Optional system libraries.
@@ skipping 176 matching lines @@
 
   if (use_xkbcommon) {
     configs += [ ":xkbcommon" ]
 
     sources += [
       "layout/xkb/scoped_xkb.h",
       "layout/xkb/xkb.h",
       "layout/xkb/xkb_evdev_codes.cc",
       "layout/xkb/xkb_evdev_codes.h",
       "layout/xkb/xkb_key_code_converter.h",
-      "layout/xkb/xkb_keyboard_code_conversion.cc",
-      "layout/xkb/xkb_keyboard_code_conversion.h",
       "layout/xkb/xkb_keyboard_layout_engine.cc",
       "layout/xkb/xkb_keyboard_layout_engine.h",
       "layout/xkb/xkb_keysym.h",
     ]
   }
 }