Remove "2" suffixes from options2 code.

chrome/browser/ui/webui/options2/chromeos/keyboard_handler2.h

-// Copyright (c) 2012 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 CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_KEYBOARD_HANDLER2_H_
-#define CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_KEYBOARD_HANDLER2_H_
-#pragma once
-
-#include "base/compiler_specific.h"
-#include "chrome/browser/prefs/pref_member.h"
-#include "chrome/browser/ui/webui/options2/options_ui2.h"
-
-namespace chromeos {
-namespace options2 {
-
-// Customize modifier keys overlay page UI handler.
-class KeyboardHandler : public ::options2::OptionsPageUIHandler {
- public:
-  KeyboardHandler();
-  virtual ~KeyboardHandler();
-
-  // OptionsPageUIHandler implementation.
-  virtual void GetLocalizedValues(DictionaryValue* localized_strings) OVERRIDE;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(KeyboardHandler);
-};
-
-}  // namespace options2
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS2_CHROMEOS_KEYBOARD_HANDLER2_H_