[KeyboardEvent] Use DOM |code| rather than Windows-based key code

ui/events/ozone/layout/layout_util.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/layout_util.h"
-
-#include "ui/events/event_constants.h"
-#include "ui/events/keycodes/dom3/dom_key.h"
-
-namespace ui {
-
-int ModifierDomKeyToEventFlag(DomKey key) {
-  switch (key) {
-    case DomKey::ALT:
-      return EF_ALT_DOWN;
-    case DomKey::ALT_GRAPH:
-      return EF_ALTGR_DOWN;
-    // ChromeOS uses F16 to represent CapsLock before the rewriting stage,
-    // based on the historical X11 implementation.
-    // TODO post-X11: Switch to use CapsLock uniformly.
-    case DomKey::F16:
-    case DomKey::CAPS_LOCK:
-      return EF_CAPS_LOCK_DOWN;
-    case DomKey::CONTROL:
-      return EF_CONTROL_DOWN;
-    case DomKey::HYPER:
-      return EF_MOD3_DOWN;
-    case DomKey::META:
-      return EF_ALT_DOWN;
-    case DomKey::OS:
-      return EF_COMMAND_DOWN;
-    case DomKey::SHIFT:
-      return EF_SHIFT_DOWN;
-    case DomKey::SUPER:
-      return EF_MOD3_DOWN;
-    default:
-      return EF_NONE;
-  }
-  // Not represented:
-  //   DomKey::ACCEL
-  //   DomKey::FN
-  //   DomKey::FN_LOCK
-  //   DomKey::NUM_LOCK
-  //   DomKey::SCROLL_LOCK
-  //   DomKey::SYMBOL
-  //   DomKey::SYMBOL_LOCK
-}
-
-}  // namespace ui