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

ios/chrome/browser/ui/settings/physical_web_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/physical_web_collection_view_controller.h"
 
 #import <CoreLocation/CoreLocation.h>
 
-#import "base/ios/weak_nsobject.h"
 #import "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #include "base/metrics/user_metrics.h"
 #include "components/google/core/browser/google_util.h"
 #include "components/physical_web/data_source/physical_web_data_source.h"
 #include "components/prefs/pref_member.h"
 #include "ios/chrome/browser/application_context.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #include "ios/chrome/browser/physical_web/physical_web_constants.h"
 #include "ios/chrome/browser/pref_names.h"
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_footer_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_switch_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/colors/MDCPalette+CrAdditions.h"
 #import "ios/chrome/browser/ui/settings/settings_utils.h"
 #import "ios/chrome/common/string_util.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/Palettes/src/MaterialPalettes.h"
 #include "ui/base/l10n/l10n_util.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) {
   SectionIdentifierPhysicalWeb = kSectionIdentifierEnumZero,
   SectionIdentifierLearnMore,
 };
 
 typedef NS_ENUM(NSInteger, ItemType) {
   ItemTypePhysicalWebSwitch = kItemTypeEnumZero,
   ItemTypeLearnMore,
@@ skipping 111 matching lines @@
 
 - (void)loadModel {
   [super loadModel];
   CollectionViewModel* model = self.collectionViewModel;
 
   [model addSectionWithIdentifier:SectionIdentifierPhysicalWeb];
 
   NSString* switchLabelText =
       l10n_util::GetNSString(IDS_IOS_OPTIONS_ENABLE_PHYSICAL_WEB);
 
-  CollectionViewSwitchItem* switchItem = [[[CollectionViewSwitchItem alloc]
-      initWithType:ItemTypePhysicalWebSwitch] autorelease];
+  CollectionViewSwitchItem* switchItem =
+      [[CollectionViewSwitchItem alloc] initWithType:ItemTypePhysicalWebSwitch];
   switchItem.text = switchLabelText;
   switchItem.on = [PhysicalWebCollectionViewController
       shouldEnableForPreferenceState:_physicalWebEnabled.GetValue()];
   [model addItem:switchItem
       toSectionWithIdentifier:SectionIdentifierPhysicalWeb];
 
   [model addSectionWithIdentifier:SectionIdentifierLearnMore];
 
   NSString* learnMoreText =
       l10n_util::GetNSString(IDS_IOS_OPTIONS_ENABLE_PHYSICAL_WEB_DETAILS);
 
-  CollectionViewFooterItem* learnMore = [[[CollectionViewFooterItem alloc]
-      initWithType:ItemTypeLearnMore] autorelease];
+  CollectionViewFooterItem* learnMore =
+      [[CollectionViewFooterItem alloc] initWithType:ItemTypeLearnMore];
   learnMore.text = learnMoreText;
   learnMore.linkURL = GURL(kPhysicalWebLearnMoreURL);
   learnMore.linkDelegate = self;
   learnMore.accessibilityTraits = UIAccessibilityTraitButton;
   [model addItem:learnMore toSectionWithIdentifier:SectionIdentifierLearnMore];
 }
 
 #pragma mark - MDCCollectionViewStylingDelegate
 
 - (MDCCollectionViewCellStyle)collectionView:(UICollectionView*)collectionView
@@ skipping 42 matching lines @@
   NSInteger type = [self.collectionViewModel itemTypeForIndexPath:indexPath];
   switch (type) {
     case ItemTypePhysicalWebSwitch:
       return YES;
     default:
       return NO;
   }
 }
 
 @end