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

ios/chrome/browser/ui/authentication/signin_account_selector_view_controller.mm

 // Copyright 2016 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/browser/ui/authentication/signin_account_selector_view_controller.h"
 
 #include <memory>
 
 #import "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/signin/chrome_identity_service_observer_bridge.h"
 #import "ios/chrome/browser/ui/authentication/resized_avatar_cache.h"
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_account_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_footer_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_text_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
 #include "ios/chrome/grit/ios_chromium_strings.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #import "ios/public/provider/chrome/browser/signin/chrome_identity.h"
 #include "ios/public/provider/chrome/browser/signin/chrome_identity_service.h"
 #import "ios/third_party/material_components_ios/src/components/AppBar/src/MaterialAppBar.h"
 #import "ios/third_party/material_components_ios/src/components/Palettes/src/MaterialPalettes.h"
 #import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
 #import "ui/base/l10n/l10n_util.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 const CGFloat kHeaderViewMinHeight = 100.;
 const CGFloat kHeaderViewHeightMultiplier = 0.33;
 const CGFloat kContentViewBottomInset = 40.;
 
 typedef NS_ENUM(NSInteger, SectionIdentifier) {
   SectionIdentifierTitle = kSectionIdentifierEnumZero,
   SectionIdentifierAccounts,
   SectionIdentifierAddAccount,
 };
 
 typedef NS_ENUM(NSInteger, ItemType) {
   ItemTypeTitle = kItemTypeEnumZero,
   ItemTypeAccount,
   ItemTypeAddAccount,
 };
 }  // namespace
 
 @interface SigninAccountSelectorViewController ()<
     ChromeIdentityServiceObserver> {
   std::unique_ptr<ChromeIdentityServiceObserverBridge> _identityServiceObserver;
   // Cache for account avatar images.
-  base::scoped_nsobject<ResizedAvatarCache> _avatarCache;
+  ResizedAvatarCache* _avatarCache;
 }
 @end
 
 @implementation SigninAccountSelectorViewController
 
 @synthesize delegate = _delegate;
 
 - (instancetype)init {
   self = [super initWithStyle:CollectionViewControllerStyleAppBar];
   if (self) {
     _identityServiceObserver.reset(
         new ChromeIdentityServiceObserverBridge(self));
-    _avatarCache.reset([[ResizedAvatarCache alloc] init]);
+    _avatarCache = [[ResizedAvatarCache alloc] init];
   }
   return self;
 }
 
 #pragma mark - UIViewController
 
 - (void)viewDidLoad {
   [super viewDidLoad];
 
   // Configure the header.
@@ skipping 10 matching lines @@
     UIEdgeInsets contentInset = self.collectionView.contentInset;
     contentInset.bottom += kContentViewBottomInset;
     self.collectionView.contentInset = contentInset;
   }];
 
   // Load the contents of the collection view.
   [self loadModel];
 }
 
 - (UIView*)contentViewWithFrame:(CGRect)frame {
-  base::scoped_nsobject<UIView> contentView(
-      [[UIView alloc] initWithFrame:frame]);
-  contentView.get().autoresizingMask =
+  UIView* contentView = [[UIView alloc] initWithFrame:frame];
+  contentView.autoresizingMask =
       (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
-  contentView.get().clipsToBounds = YES;
+  contentView.clipsToBounds = YES;
 
-  base::scoped_nsobject<UILabel> titleLabel(
-      [[UILabel alloc] initWithFrame:CGRectZero]);
-  titleLabel.get().text =
+  UILabel* titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];
+  titleLabel.text =
       l10n_util::GetNSString(IDS_IOS_ACCOUNT_CONSISTENCY_SETUP_TITLE);
-  titleLabel.get().textColor = [[MDCPalette greyPalette] tint900];
-  titleLabel.get().font = [MDCTypography headlineFont];
-  titleLabel.get().translatesAutoresizingMaskIntoConstraints = NO;
+  titleLabel.textColor = [[MDCPalette greyPalette] tint900];
+  titleLabel.font = [MDCTypography headlineFont];
+  titleLabel.translatesAutoresizingMaskIntoConstraints = NO;
 
-  base::scoped_nsobject<UIView> divider(
-      [[UIView alloc] initWithFrame:CGRectZero]);
-  divider.get().backgroundColor = [[MDCPalette greyPalette] tint300];
-  divider.get().translatesAutoresizingMaskIntoConstraints = NO;
+  UIView* divider = [[UIView alloc] initWithFrame:CGRectZero];
+  divider.backgroundColor = [[MDCPalette greyPalette] tint300];
+  divider.translatesAutoresizingMaskIntoConstraints = NO;
 
-  base::scoped_nsobject<UILayoutGuide> layoutGuide1(
-      [[UILayoutGuide alloc] init]);
-  base::scoped_nsobject<UILayoutGuide> layoutGuide2(
-      [[UILayoutGuide alloc] init]);
+  UILayoutGuide* layoutGuide1 = [[UILayoutGuide alloc] init];
+  UILayoutGuide* layoutGuide2 = [[UILayoutGuide alloc] init];
 
   [contentView addSubview:titleLabel];
   [contentView addSubview:divider];
   [contentView addLayoutGuide:layoutGuide1];
   [contentView addLayoutGuide:layoutGuide2];
 
   NSDictionary* views = @{
     @"title" : titleLabel,
     @"divider" : divider,
     @"v1" : layoutGuide1,
     @"v2" : layoutGuide2
   };
   NSArray* constraints = @[
     @"V:[title]-(16)-[divider(==1)]|",
     @"H:|[v1(16)][title(<=440)][v2(>=v1)]|",
     @"H:|[divider]|",
   ];
   ApplyVisualConstraints(constraints, views);
-  return contentView.autorelease();
+  return contentView = nil;
 }
 
 - (void)viewWillLayoutSubviews {
   CGSize viewSize = self.view.bounds.size;
   MDCFlexibleHeaderView* headerView =
       self.appBar.headerViewController.headerView;
   headerView.maximumHeight =
       MAX(kHeaderViewMinHeight, kHeaderViewHeightMultiplier * viewSize.height);
 }
 
@@ skipping 17 matching lines @@
           toSectionWithIdentifier:SectionIdentifierAccounts];
     }
     [model addSectionWithIdentifier:SectionIdentifierAddAccount];
     [model addItem:[self addAccountItem]
         toSectionWithIdentifier:SectionIdentifierAddAccount];
   }
 }
 
 - (CollectionViewItem*)titleItem {
   // TODO(crbug.com/662549) : Rename FooterItem to be used as regular item.
-  CollectionViewFooterItem* item = [[[CollectionViewFooterItem alloc]
-      initWithType:ItemTypeTitle] autorelease];
+  CollectionViewFooterItem* item =
+      [[CollectionViewFooterItem alloc] initWithType:ItemTypeTitle];
   item.text =
       l10n_util::GetNSString(IDS_IOS_ACCOUNT_CONSISTENCY_SETUP_DESCRIPTION);
   return item;
 }
 
 - (CollectionViewItem*)accountItemForIdentity:(ChromeIdentity*)identity
                                       checked:(BOOL)isChecked {
-  CollectionViewAccountItem* item = [[[CollectionViewAccountItem alloc]
-      initWithType:ItemTypeAccount] autorelease];
+  CollectionViewAccountItem* item =
+      [[CollectionViewAccountItem alloc] initWithType:ItemTypeAccount];
   [self updateAccountItem:item withIdentity:identity];
   if (isChecked) {
     item.accessoryType = MDCCollectionViewCellAccessoryCheckmark;
   }
   return item;
 }
 
 - (void)updateAccountItem:(CollectionViewAccountItem*)item
              withIdentity:(ChromeIdentity*)identity {
   item.image = [_avatarCache resizedAvatarForIdentity:identity];
   item.text = identity.userEmail;
   item.chromeIdentity = identity;
 }
 
 - (CollectionViewItem*)addAccountItem {
-  CollectionViewAccountItem* item = [[[CollectionViewAccountItem alloc]
-      initWithType:ItemTypeAddAccount] autorelease];
+  CollectionViewAccountItem* item =
+      [[CollectionViewAccountItem alloc] initWithType:ItemTypeAddAccount];
   item.text = l10n_util::GetNSString(
       IDS_IOS_ACCOUNT_CONSISTENCY_SETUP_ADD_ACCOUNT_BUTTON);
   item.image = [UIImage imageNamed:@"settings_accounts_add_account"];
   return item;
 }
 
 - (ChromeIdentity*)selectedIdentity {
   NSArray* accountItems = [self.collectionViewModel
       itemsInSectionWithIdentifier:SectionIdentifierAccounts];
   for (CollectionViewAccountItem* accountItem in accountItems) {
@@ skipping 10 matching lines @@
     didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
   [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
   CollectionViewItem* item =
       [self.collectionViewModel itemAtIndexPath:indexPath];
   if (item.type == ItemTypeAccount) {
     CollectionViewAccountItem* selectedAccountItem =
         base::mac::ObjCCastStrict<CollectionViewAccountItem>(item);
     // TODO(crbug.com/631486) : Checkmark animation.
     selectedAccountItem.accessoryType = MDCCollectionViewCellAccessoryCheckmark;
 
-    base::scoped_nsobject<NSMutableArray<CollectionViewItem*>> reloadItems(
-        [[NSMutableArray alloc] init]);
+    NSMutableArray<CollectionViewItem*>* reloadItems =
+        [[NSMutableArray alloc] init];
     [reloadItems addObject:selectedAccountItem];
 
     // Uncheck all the other account items.
     NSArray* accountItems = [self.collectionViewModel
         itemsInSectionWithIdentifier:SectionIdentifierAccounts];
     for (CollectionViewAccountItem* accountItem in accountItems) {
       if (accountItem != selectedAccountItem &&
           accountItem.accessoryType != MDCCollectionViewCellAccessoryNone) {
         // TODO(crbug.com/631486) : Checkmark animation.
         accountItem.accessoryType = MDCCollectionViewCellAccessoryNone;
@@ skipping 79 matching lines @@
       [self.collectionViewModel itemTypeForIndexPath:indexPath];
   return (itemType == ItemTypeTitle);
 }
 
 - (BOOL)collectionView:(nonnull UICollectionView*)collectionView
     shouldHideItemBackgroundAtIndexPath:(nonnull NSIndexPath*)indexPath {
   return YES;
 }
 
 @end