Remove "2" suffixes from options2 code.

chrome/browser/ui/webui/options2/chromeos/stats_options_handler2.cc

-// 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.
-
-#include "chrome/browser/ui/webui/options2/chromeos/stats_options_handler2.h"
-
-#include "base/bind.h"
-#include "base/bind_helpers.h"
-#include "base/utf_string_conversions.h"
-#include "base/values.h"
-#include "content/public/browser/user_metrics.h"
-#include "content/public/browser/web_ui.h"
-
-using content::UserMetricsAction;
-
-namespace chromeos {
-namespace options2 {
-
-StatsOptionsHandler::StatsOptionsHandler() {
-}
-
-// OptionsPageUIHandler implementation.
-void StatsOptionsHandler::GetLocalizedValues(
-    DictionaryValue* localized_strings) {
-}
-
-// WebUIMessageHandler implementation.
-void StatsOptionsHandler::RegisterMessages() {
-  web_ui()->RegisterMessageCallback("metricsReportingCheckboxAction",
-      base::Bind(&StatsOptionsHandler::HandleMetricsReportingCheckbox,
-                 base::Unretained(this)));
-}
-
-void StatsOptionsHandler::HandleMetricsReportingCheckbox(
-    const ListValue* args) {
-#if defined(GOOGLE_CHROME_BUILD)
-  const std::string checked_str = UTF16ToUTF8(ExtractStringValue(args));
-  const bool enabled = (checked_str == "true");
-  content::RecordAction(
-      enabled ?
-      UserMetricsAction("Options_MetricsReportingCheckbox_Enable") :
-      UserMetricsAction("Options_MetricsReportingCheckbox_Disable"));
-#endif
-}
-
-}  // namespace options2
-}  // namespace chromeos