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

components/signin/ios/browser/fake_profile_oauth2_token_service_ios_provider.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 "components/signin/ios/browser/fake_profile_oauth2_token_service_ios_provider.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 FakeProfileOAuth2TokenServiceIOSProvider::
     FakeProfileOAuth2TokenServiceIOSProvider() {
 }
 
 FakeProfileOAuth2TokenServiceIOSProvider::
     ~FakeProfileOAuth2TokenServiceIOSProvider() {
 }
 
 void FakeProfileOAuth2TokenServiceIOSProvider::GetAccessToken(
     const std::string& account_id,
@@ skipping 34 matching lines @@
     callback.Run(access_token, one_hour_from_now, nil);
   }
   requests_.clear();
 }
 
 void FakeProfileOAuth2TokenServiceIOSProvider::
     IssueAccessTokenErrorForAllRequests() {
   for (auto i = requests_.begin(); i != requests_.end(); ++i) {
     std::string account_id = i->first;
     AccessTokenCallback callback = i->second;
-    NSError* error = [[[NSError alloc] initWithDomain:@"fake_access_token_error"
-                                                 code:-1
-                                             userInfo:nil] autorelease];
+    NSError* error = [[NSError alloc] initWithDomain:@"fake_access_token_error"
+                                                code:-1
+                                            userInfo:nil];
     callback.Run(nil, nil, error);
   }
   requests_.clear();
 }
 
 AuthenticationErrorCategory
 FakeProfileOAuth2TokenServiceIOSProvider::GetAuthenticationErrorCategory(
     const std::string& gaia_id,
     NSError* error) const {
   DCHECK(error);
   return kAuthenticationErrorCategoryAuthorizationErrors;
 }