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

ui/events/ozone/layout/xkb/xkb_keyboard_code_conversion.h

-// 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.
-
-#ifndef UI_EVENTS_OZONE_LAYOUT_XKB_XKB_KEYBOARD_CODE_CONVERSION_H_
-#define UI_EVENTS_OZONE_LAYOUT_XKB_XKB_KEYBOARD_CODE_CONVERSION_H_
-
-// TODO(kpschoedel): move this file out of Ozone so that it can be used to
-// determine DomKey for desktop X11, OR switch desktop X11 to use the Ozone
-// keyboard layout interface.
-
-#include <xkbcommon/xkbcommon.h>
-
-#include "base/strings/string16.h"
-#include "ui/events/keycodes/keyboard_codes.h"
-
-namespace ui {
-
-enum class DomKey;
-
-// Returns the DomKey associated with a non-character xkb_keysym_t.
-// Returns DomKey::NONE for unrecognized keysyms, which includes
-// all printable characters.
-DomKey NonPrintableXkbKeySymToDomKey(xkb_keysym_t keysym);
-
-// Returns the dead key combining character associated with an xkb_keysym_t,
-// or 0 if the keysym is not recognized.
-base::char16 DeadXkbKeySymToCombiningCharacter(xkb_keysym_t keysym);
-
-}  // namespace ui
-
-#endif  // UI_EVENTS_OZONE_LAYOUT_XKB_XKB_KEYBOARD_CODE_CONVERSION_H_