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

ui/events/ozone/layout/stub/stub_keyboard_layout_engine.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/stub/stub_keyboard_layout_engine.h"
 
 #include <algorithm>
 
 #include "base/strings/string16.h"
 #include "ui/events/event.h"
@@ skipping 23 matching lines @@
   return false;
 }
 
 bool StubKeyboardLayoutEngine::UsesAltGr() const {
   return true;
 }
 
 bool StubKeyboardLayoutEngine::Lookup(DomCode dom_code,
                                       int flags,
                                       DomKey* out_dom_key,
-                                      base::char16* out_character,
                                       KeyboardCode* out_key_code,
                                       uint32* platform_keycode) const {
-  return DomCodeToUsLayoutMeaning(dom_code, flags, out_dom_key, out_character,
-                                  out_key_code);
+  return DomCodeToUsLayoutDomKey(dom_code, flags, out_dom_key, out_key_code);
 }
 
 }  // namespace ui