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

ios/chrome/browser/ui/settings/time_range_selector_collection_view_controller.mm

Index: ios/chrome/browser/ui/settings/time_range_selector_collection_view_controller.mm
diff --git a/ios/chrome/browser/ui/settings/time_range_selector_collection_view_controller.mm b/ios/chrome/browser/ui/settings/time_range_selector_collection_view_controller.mm
index 23bedfa6ef86cee355cf24c0f0b9f44029cadf55..40e2bc5a018b526713f64a7b322e5aa97e565070 100644
--- a/ios/chrome/browser/ui/settings/time_range_selector_collection_view_controller.mm
+++ b/ios/chrome/browser/ui/settings/time_range_selector_collection_view_controller.mm
@@ -4,9 +4,7 @@
 
 #import "ios/chrome/browser/ui/settings/time_range_selector_collection_view_controller.h"
 
-#import "base/ios/weak_nsobject.h"
 #import "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #include "components/browsing_data/core/pref_names.h"
 #include "components/prefs/pref_member.h"
 #include "components/prefs/pref_service.h"
@@ -16,6 +14,10 @@
 #import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 typedef NS_ENUM(NSInteger, SectionIdentifier) {
@@ -47,8 +49,7 @@ static_assert(
 @interface TimeRangeSelectorCollectionViewController () {
   // Instance of the parent view controller needed in order to set the time
   // range for the browsing data deletion.
-  base::WeakNSProtocol<id<TimeRangeSelectorCollectionViewControllerDelegate>>
-      _weakDelegate;
+  __weak id<TimeRangeSelectorCollectionViewControllerDelegate> _weakDelegate;
   IntegerPrefMember timeRangePref_;
 }
 
@@ -68,7 +69,7 @@ initWithPrefs:(PrefService*)prefs
      delegate:(id<TimeRangeSelectorCollectionViewControllerDelegate>)delegate {
   self = [super initWithStyle:CollectionViewControllerStyleAppBar];
   if (self) {
-    _weakDelegate.reset(delegate);
+    _weakDelegate = delegate;
     self.title = l10n_util::GetNSString(
         IDS_IOS_CLEAR_BROWSING_DATA_TIME_RANGE_SELECTOR_TITLE);
     timeRangePref_.Init(browsing_data::prefs::kDeleteTimePeriod, prefs);
@@ -137,7 +138,7 @@ initWithPrefs:(PrefService*)prefs
 - (CollectionViewTextItem*)timeRangeItemWithOption:(ItemType)itemOption
                                      textMessageID:(int)textMessageID {
   CollectionViewTextItem* item =
-      [[[CollectionViewTextItem alloc] initWithType:itemOption] autorelease];
+      [[CollectionViewTextItem alloc] initWithType:itemOption];
   [item setText:l10n_util::GetNSString(textMessageID)];
   [item setAccessibilityTraits:UIAccessibilityTraitButton];
   return item;