[ObjC ARC] Converts ios/chrome/common/app_group:app_group to ARC.Automatically generated ARCMigra…

ios/chrome/common/app_group/app_group_constants.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/common/app_group/app_group_constants.h"
 
 #include "base/logging.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/version_info/version_info.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 NSString* const kChromeAppGroupIdentifier =
     @"group." IOS_BUNDLE_ID_PREFIX ".chrome";
 }
 
 namespace app_group {
 
 const char kChromeAppGroupXCallbackCommand[] = "app-group-command";
 
 const char kChromeAppGroupCommandPreference[] =
@@ skipping 37 matching lines @@
       return base::SysUTF8ToNSString(version_info::GetProductName());
     case APP_GROUP_TODAY_EXTENSION:
       return @"TodayExtension";
   }
 }
 
 NSUserDefaults* GetGroupUserDefaults() {
   NSUserDefaults* defaults = nil;
   NSString* applicationGroup = ApplicationGroup();
   if (applicationGroup) {
-    defaults = [[[NSUserDefaults alloc] initWithSuiteName:applicationGroup]
-        autorelease];
+    defaults = [[NSUserDefaults alloc] initWithSuiteName:applicationGroup];
     if (defaults)
       return defaults;
   }
 
   // On a device, the entitlements should always provide an application group to
   // the application. This is not the case on simulator.
   DCHECK(TARGET_IPHONE_SIMULATOR);
   return [NSUserDefaults standardUserDefaults];
 }
 
 NSURL* ShareExtensionItemsFolder() {
   NSURL* groupURL = [[NSFileManager defaultManager]
       containerURLForSecurityApplicationGroupIdentifier:ApplicationGroup()];
   NSURL* readingListURL =
       [groupURL URLByAppendingPathComponent:@"ShareExtensionItems"
                                 isDirectory:YES];
   return readingListURL;
 }
 
 }  // namespace app_group