[ObjC ARC] Converts ios/chrome/browser/ui/webui:webui to ARC.

ios/chrome/browser/ui/webui/version_ui.mm

 // Copyright 2015 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 "ios/chrome/browser/ui/webui/version_ui.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "components/grit/components_resources.h"
 #include "components/strings/grit/components_chromium_strings.h"
 #include "components/strings/grit/components_google_chrome_strings.h"
 #include "components/strings/grit/components_strings.h"
 #include "components/version_info/version_info.h"
 #include "components/version_ui/version_ui_constants.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #include "ios/chrome/browser/ui/ui_util.h"
 #include "ios/chrome/browser/ui/webui/version_handler.h"
 #include "ios/chrome/common/channel_info.h"
 #include "ios/chrome/grit/ios_chromium_strings.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/web/public/web_client.h"
 #include "ios/web/public/web_ui_ios_data_source.h"
 #include "ios/web/public/webui/web_ui_ios.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 web::WebUIIOSDataSource* CreateVersionUIDataSource() {
   web::WebUIIOSDataSource* html_source =
       web::WebUIIOSDataSource::Create(kChromeUIVersionHost);
 
   // Localized and data strings.
   html_source->AddLocalizedString(version_ui::kTitle, IDS_VERSION_UI_TITLE);
   html_source->AddLocalizedString(version_ui::kApplicationLabel,
                                   IDS_IOS_PRODUCT_NAME);
@@ skipping 64 matching lines @@
 
 }  // namespace
 
 VersionUI::VersionUI(web::WebUIIOS* web_ui) : web::WebUIIOSController(web_ui) {
   web_ui->AddMessageHandler(new VersionHandler());
   web::WebUIIOSDataSource::Add(ios::ChromeBrowserState::FromWebUIIOS(web_ui),
                                CreateVersionUIDataSource());
 }
 
 VersionUI::~VersionUI() {}