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

ios/chrome/browser/ui/settings/bandwidth_management_collection_view_controller.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.
 
 #import "ios/chrome/browser/ui/settings/bandwidth_management_collection_view_controller.h"
 
 #include "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #include "components/prefs/pref_change_registrar.h"
 #include "components/prefs/pref_service.h"
 #include "ios/chrome/browser/browser_state/chrome_browser_state.h"
 #include "ios/chrome/browser/pref_names.h"
 #import "ios/chrome/browser/prefs/pref_observer_bridge.h"
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_detail_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_footer_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
 #import "ios/chrome/browser/ui/settings/dataplan_usage_collection_view_controller.h"
 #import "ios/chrome/browser/ui/settings/settings_utils.h"
 #include "ios/chrome/grit/ios_chromium_strings.h"
 #include "ios/chrome/grit/ios_strings.h"
 #import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
 #import "ios/third_party/material_components_ios/src/components/Palettes/src/MaterialPalettes.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 typedef NS_ENUM(NSInteger, SectionIdentifier) {
   SectionIdentifierActions = kSectionIdentifierEnumZero,
   SectionIdentifierFooter,
 };
 
 typedef NS_ENUM(NSInteger, ItemType) {
   ItemTypePreload = kItemTypeEnumZero,
   ItemTypeFooter,
 };
 
 }  // namespace
 
 @interface BandwidthManagementCollectionViewController ()<
     PrefObserverDelegate> {
   ios::ChromeBrowserState* _browserState;  // weak
 
   // Pref observer to track changes to prefs.
   std::unique_ptr<PrefObserverBridge> _prefObserverBridge;
   // Registrar for pref changes notifications.
   PrefChangeRegistrar _prefChangeRegistrarApplicationContext;
 
   // Updatable Items
-  base::scoped_nsobject<CollectionViewDetailItem> _preloadWebpagesDetailItem;
+  CollectionViewDetailItem* _preloadWebpagesDetailItem;
 }
 
 // Helpers to create collection view items.
 - (CollectionViewItem*)preloadWebpagesItem;
 - (CollectionViewItem*)footerItem;
 @end
 
 @implementation BandwidthManagementCollectionViewController
 
 - (instancetype)initWithBrowserState:(ios::ChromeBrowserState*)browserState {
@@ skipping 32 matching lines @@
   [model addSectionWithIdentifier:SectionIdentifierFooter];
   [model addItem:[self footerItem]
       toSectionWithIdentifier:SectionIdentifierFooter];
 }
 
 - (CollectionViewItem*)preloadWebpagesItem {
   NSString* detailText = [DataplanUsageCollectionViewController
       currentLabelForPreference:_browserState->GetPrefs()
                        basePref:prefs::kNetworkPredictionEnabled
                        wifiPref:prefs::kNetworkPredictionWifiOnly];
-  _preloadWebpagesDetailItem.reset(
-      [[CollectionViewDetailItem alloc] initWithType:ItemTypePreload]);
+  _preloadWebpagesDetailItem =
+      [[CollectionViewDetailItem alloc] initWithType:ItemTypePreload];
 
-  _preloadWebpagesDetailItem.get().text =
+  _preloadWebpagesDetailItem.text =
       l10n_util::GetNSString(IDS_IOS_OPTIONS_PRELOAD_WEBPAGES);
-  _preloadWebpagesDetailItem.get().detailText = detailText;
-  _preloadWebpagesDetailItem.get().accessoryType =
+  _preloadWebpagesDetailItem.detailText = detailText;
+  _preloadWebpagesDetailItem.accessoryType =
       MDCCollectionViewCellAccessoryDisclosureIndicator;
-  _preloadWebpagesDetailItem.get().accessibilityTraits |=
-      UIAccessibilityTraitButton;
+  _preloadWebpagesDetailItem.accessibilityTraits |= UIAccessibilityTraitButton;
   return _preloadWebpagesDetailItem;
 }
 
 - (CollectionViewItem*)footerItem {
-  CollectionViewFooterItem* item = [[[CollectionViewFooterItem alloc]
-      initWithType:ItemTypeFooter] autorelease];
+  CollectionViewFooterItem* item =
+      [[CollectionViewFooterItem alloc] initWithType:ItemTypeFooter];
 
   item.text = l10n_util::GetNSString(
       IDS_IOS_BANDWIDTH_MANAGEMENT_DESCRIPTION_LEARN_MORE);
   item.linkURL =
       GURL(l10n_util::GetStringUTF8(IDS_IOS_BANDWIDTH_MANAGEMENT_LEARN_URL));
   item.linkDelegate = self;
   item.accessibilityTraits |= UIAccessibilityTraitButton;
   return item;
 }
 
@@ skipping 10 matching lines @@
 }
 
 - (void)collectionView:(UICollectionView*)collectionView
     didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
   [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
 
   NSInteger type = [self.collectionViewModel itemTypeForIndexPath:indexPath];
   if (type == ItemTypePreload) {
     NSString* preloadTitle =
         l10n_util::GetNSString(IDS_IOS_OPTIONS_PRELOAD_WEBPAGES);
-    base::scoped_nsobject<UIViewController> controller(
+    UIViewController* controller =
         [[DataplanUsageCollectionViewController alloc]
             initWithPrefs:_browserState->GetPrefs()
                  basePref:prefs::kNetworkPredictionEnabled
                  wifiPref:prefs::kNetworkPredictionWifiOnly
-                    title:preloadTitle]);
+                    title:preloadTitle];
     [self.navigationController pushViewController:controller animated:YES];
   }
 }
 
 #pragma mark - MDCCollectionViewStylingDelegate
 
 - (MDCCollectionViewCellStyle)collectionView:(UICollectionView*)collectionView
                          cellStyleForSection:(NSInteger)section {
   NSInteger sectionIdentifier =
       [self.collectionViewModel sectionIdentifierForSection:section];
@@ skipping 36 matching lines @@
 #pragma mark - PrefObserverDelegate
 
 - (void)onPreferenceChanged:(const std::string&)preferenceName {
   if (preferenceName == prefs::kNetworkPredictionEnabled ||
       preferenceName == prefs::kNetworkPredictionWifiOnly) {
     NSString* detailText = [DataplanUsageCollectionViewController
         currentLabelForPreference:_browserState->GetPrefs()
                          basePref:prefs::kNetworkPredictionEnabled
                          wifiPref:prefs::kNetworkPredictionWifiOnly];
 
-    _preloadWebpagesDetailItem.get().detailText = detailText;
+    _preloadWebpagesDetailItem.detailText = detailText;
 
     [self reconfigureCellsForItems:@[ _preloadWebpagesDetailItem ]
            inSectionWithIdentifier:SectionIdentifierActions];
   }
 }
 
 @end