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

ui/events/ozone/layout/no/no_keyboard_layout_engine.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_NO_NO_KEYBOARD_LAYOUT_ENGINE_H_
 #define UI_EVENTS_OZONE_LAYOUT_NO_NO_KEYBOARD_LAYOUT_ENGINE_H_
 
 #include "ui/events/ozone/layout/events_ozone_layout_export.h"
 #include "ui/events/ozone/layout/keyboard_layout_engine.h"
 
 namespace ui {
 
 class EVENTS_OZONE_LAYOUT_EXPORT NoKeyboardLayoutEngine
     : public KeyboardLayoutEngine {
  public:
   NoKeyboardLayoutEngine() {}
   ~NoKeyboardLayoutEngine() override {}
 
   // KeyboardLayoutEngine overrides:
   bool CanSetCurrentLayout() const override;
   bool SetCurrentLayoutByName(const std::string& layout_name) override;
   bool UsesISOLevel5Shift() const override;
   bool UsesAltGr() const override;
   bool Lookup(DomCode dom_code,
               int flags,
               DomKey* dom_key,
-              base::char16* character,
               KeyboardCode* key_code,
               uint32* platform_keycode) const override;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_OZONE_LAYOUT_NO_NO_KEYBOARD_LAYOUT_ENGINE_H_