[ObjC ARC] Converts components/signin/ios/browser:browser to ARC.

components/signin/ios/browser/profile_oauth2_token_service_ios_delegate.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 "components/signin/ios/browser/profile_oauth2_token_service_ios_delegate.h"
 
 #import <Foundation/Foundation.h>
 
 #include <memory>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/stl_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/values.h"
 #include "components/prefs/pref_service.h"
 #include "components/prefs/scoped_user_pref_update.h"
 #include "components/signin/core/browser/account_info.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "components/signin/core/browser/signin_client.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "components/signin/ios/browser/profile_oauth2_token_service_ios_provider.h"
 #include "google_apis/gaia/oauth2_access_token_fetcher.h"
 #include "net/url_request/url_request_status.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 // Match the way Chromium handles authentication errors in
 // google_apis/gaia/oauth2_access_token_fetcher.cc:
 GoogleServiceAuthError GetGoogleServiceAuthErrorFromNSError(
     ProfileOAuth2TokenServiceIOSProvider* provider,
     const std::string& gaia_id,
     NSError* error) {
   if (!error)
     return GoogleServiceAuthError::AuthErrorNone();
@@ skipping 345 matching lines @@
     accounts_.erase(account_id);
     FireRefreshTokenRevoked(account_id);
   }
 }
 
 void ProfileOAuth2TokenServiceIOSDelegate::ClearExcludedSecondaryAccounts() {
   client_->GetPrefs()->ClearPref(
       prefs::kTokenServiceExcludeAllSecondaryAccounts);
   client_->GetPrefs()->ClearPref(prefs::kTokenServiceExcludedSecondaryAccounts);
 }