[ObjC ARC] Converts ios/chrome/browser/browsing_data:browsing_data.

ios/chrome/browser/browsing_data/ios_chrome_browsing_data_remover.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/browsing_data/ios_chrome_browsing_data_remover.h"
 
 #include <map>
 #include <set>
 #include <string>
 
@@ skipping 27 matching lines @@
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #include "ios/web/public/web_thread.h"
 #include "net/base/net_errors.h"
 #include "net/cookies/cookie_store.h"
 #include "net/http/transport_security_state.h"
 #include "net/ssl/channel_id_service.h"
 #include "net/ssl/channel_id_store.h"
 #include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_context_getter.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 using base::UserMetricsAction;
 using web::WebThread;
 
 namespace {
 
 using CallbackList = base::CallbackList<void(
     const IOSChromeBrowsingDataRemover::NotificationDetails&)>;
 
 // Contains all registered callbacks for browsing data removed notifications.
 CallbackList* g_on_browsing_data_removed_callbacks = nullptr;
@@ skipping 445 matching lines @@
   waiting_for_clear_autofill_origin_urls_ = false;
   NotifyAndDeleteIfDone();
 }
 
 // static
 IOSChromeBrowsingDataRemover::CallbackSubscription
 IOSChromeBrowsingDataRemover::RegisterOnBrowsingDataRemovedCallback(
     const IOSChromeBrowsingDataRemover::Callback& callback) {
   return GetOnBrowsingDataRemovedCallbacks()->Add(callback);
 }