Convert //ios/web_view/internal to ARC.

ios/web_view/internal/criwv_browser_state.mm

 // 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 "ios/web_view/internal/criwv_browser_state.h"
 
 #include <memory>
 
 #include "base/base_paths.h"
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/threading/thread_restrictions.h"
 #include "components/pref_registry/pref_registry_syncable.h"
 #include "components/prefs/json_pref_store.h"
 #include "components/prefs/pref_filter.h"
 #include "components/prefs/pref_service_factory.h"
 #include "components/translate/core/browser/translate_prefs.h"
 #include "components/translate/core/common/translate_pref_names.h"
 #include "ios/web/public/web_thread.h"
 #include "ios/web_view/internal/criwv_url_request_context_getter.h"
 #include "ios/web_view/internal/pref_names.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 const char kPreferencesFilename[] = FILE_PATH_LITERAL("Preferences");
 }
 
 namespace ios_web_view {
 
 CRIWVBrowserState::CRIWVBrowserState(bool off_the_record)
     : web::BrowserState(), off_the_record_(off_the_record) {
   CHECK(PathService::Get(base::DIR_APP_DATA, &path_));
 
@@ skipping 49 matching lines @@
   // TODO(crbug.com/679895): Find a good value for the kAcceptLanguages pref.
   // TODO(crbug.com/679895): Pass this value to the network stack somehow, for
   // the HTTP header.
   pref_registry->RegisterStringPref(prefs::kAcceptLanguages,
                                     l10n_util::GetLocaleOverride());
   pref_registry->RegisterBooleanPref(prefs::kEnableTranslate, true);
   translate::TranslatePrefs::RegisterProfilePrefs(pref_registry);
 }
 
 }  // namespace ios_web_view