[ObjC ARC] Converts ios/chrome/browser/ui/sync:sync to ARC.

ios/chrome/browser/ui/sync/sync_util.mm

 // Copyright 2012 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.
 
 #import "ios/chrome/browser/ui/sync/sync_util.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "components/infobars/core/infobar_manager.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/sync/sync_setup_service.h"
 #include "ios/chrome/browser/sync/sync_setup_service_factory.h"
 #import "ios/chrome/browser/tabs/tab.h"
 #import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/commands/show_signin_command.h"
 #include "ios/chrome/browser/ui/sync/sync_error_infobar_delegate.h"
 #include "ios/chrome/grit/ios_chromium_strings.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // Enumerated constants for logging when a sign-in error infobar was shown
 // to the user. This was added for crbug/265352 to quantify how often this
 // bug shows up in the wild. The logged histogram count should be interpreted
 // as a ratio of the number of active sync users.
 enum {
   SYNC_SIGN_IN_NEEDS_UPDATE = 1,
   SYNC_SERVICE_UNAVAILABLE,
   SYNC_NEEDS_PASSPHRASE,
   SYNC_UNRECOVERABLE_ERROR,
@@ skipping 70 matching lines @@
 
 GenericChromeCommand* GetSyncCommandForBrowserState(
     ios::ChromeBrowserState* browserState) {
   SyncSetupService* syncSetupService =
       SyncSetupServiceFactory::GetForBrowserState(browserState);
   DCHECK(syncSetupService);
   SyncSetupService::SyncServiceState syncState =
       syncSetupService->GetSyncServiceState();
   switch (syncState) {
     case SyncSetupService::kSyncServiceSignInNeedsUpdate:
-      return [[[ShowSigninCommand alloc]
+      return [[ShowSigninCommand alloc]
           initWithOperation:AUTHENTICATION_OPERATION_REAUTHENTICATE
-                accessPoint:signin_metrics::AccessPoint::ACCESS_POINT_UNKNOWN]
-          autorelease];
+                accessPoint:signin_metrics::AccessPoint::ACCESS_POINT_UNKNOWN];
     case SyncSetupService::kSyncServiceNeedsPassphrase:
-      return [[[GenericChromeCommand alloc]
-          initWithTag:IDC_SHOW_SYNC_PASSPHRASE_SETTINGS] autorelease];
+      return [[GenericChromeCommand alloc]
+          initWithTag:IDC_SHOW_SYNC_PASSPHRASE_SETTINGS];
     case SyncSetupService::kSyncServiceCouldNotConnect:
     case SyncSetupService::kSyncServiceServiceUnavailable:
     case SyncSetupService::kSyncServiceUnrecoverableError:
     case SyncSetupService::kNoSyncServiceError:
-      return [[[GenericChromeCommand alloc] initWithTag:IDC_SHOW_SYNC_SETTINGS]
-          autorelease];
+      return [[GenericChromeCommand alloc] initWithTag:IDC_SHOW_SYNC_SETTINGS];
   }
 }
 
 bool displaySyncErrors(ios::ChromeBrowserState* browser_state, Tab* tab) {
   // Avoid displaying sync errors on incognito tabs.
   if (browser_state->IsOffTheRecord())
     return false;
 
   SyncSetupService* syncSetupService =
       SyncSetupServiceFactory::GetForBrowserState(browser_state);
@@ skipping 38 matching lines @@
       return true;
     case SyncSetupService::kSyncServiceSignInNeedsUpdate:
     case SyncSetupService::kSyncServiceNeedsPassphrase:
     case SyncSetupService::kSyncServiceUnrecoverableError:
       return false;
   }
 }
 
 }  // namespace sync
 }  // namespace ios_internal