Consolidate ui/events/keycodes/dom[34]/ into .../dom/

ui/events/ozone/layout/xkb/xkb_evdev_codes.cc

 // 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.
 
 #include "ui/events/ozone/layout/xkb/xkb_evdev_codes.h"
 
-#include "ui/events/keycodes/dom4/keycode_converter.h"
+#include "ui/events/keycodes/dom/keycode_converter.h"
 
 namespace ui {
 
 XkbEvdevCodes::XkbEvdevCodes() {
   invalid_xkb_keycode_ =
       static_cast<xkb_keycode_t>(KeycodeConverter::InvalidNativeKeycode());
 }
 
 XkbEvdevCodes::~XkbEvdevCodes() {
 }
 
 xkb_keycode_t XkbEvdevCodes::DomCodeToXkbKeyCode(DomCode dom_code) const {
   // This assumes KeycodeConverter has been built with evdev/xkb codes.
   return static_cast<xkb_keycode_t>(
       KeycodeConverter::DomCodeToNativeKeycode(dom_code));
 }
 
 }  // namespace ui