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

components/signin/ios/browser/profile_oauth2_token_service_ios_delegate_unittest.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"
 
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/testing_pref_service.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "components/signin/core/browser/profile_oauth2_token_service.h"
 #include "components/signin/core/browser/test_signin_client.h"
 #include "components/signin/core/common/signin_pref_names.h"
 #include "components/signin/ios/browser/fake_profile_oauth2_token_service_ios_provider.h"
 #include "google_apis/gaia/gaia_urls.h"
 #include "google_apis/gaia/oauth2_access_token_consumer.h"
 #include "google_apis/gaia/oauth2_token_service_test_util.h"
 #include "net/url_request/test_url_fetcher_factory.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 typedef ProfileOAuth2TokenServiceIOSProvider::AccountInfo ProviderAccount;
 
 class ProfileOAuth2TokenServiceIOSDelegateTest
     : public testing::Test,
       public OAuth2AccessTokenConsumer,
       public OAuth2TokenService::Observer,
       public SigninErrorController::Observer {
  public:
   ProfileOAuth2TokenServiceIOSDelegateTest()
       : factory_(NULL),
@@ skipping 258 matching lines @@
   ResetObserverCounts();
   GoogleServiceAuthError error(GoogleServiceAuthError::SERVICE_ERROR);
   oauth2_delegate_->UpdateAuthError(GetAccountId(account1), error);
   EXPECT_EQ(1, error_changed_count_);
 
   oauth2_delegate_->RevokeAllCredentials();
   ResetObserverCounts();
   oauth2_delegate_->UpdateAuthError(GetAccountId(account1), error);
   EXPECT_EQ(0, error_changed_count_);
 }