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

ios/chrome/browser/ui/settings/autofill_edit_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/autofill_edit_collection_view_controller.h"
 
 #include "base/logging.h"
 #import "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/ui/autofill/autofill_edit_accessory_view.h"
 #import "ios/chrome/browser/ui/autofill/cells/autofill_edit_item.h"
 #import "ios/chrome/browser/ui/settings/autofill_edit_collection_view_controller+protected.h"
 #import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 
 AutofillEditCell* AutofillEditCellForTextField(UITextField* textField) {
   AutofillEditCell* settingsCell = nil;
   for (UIView* view = textField; view; view = [view superview]) {
     AutofillEditCell* cell = base::mac::ObjCCast<AutofillEditCell>(view);
     if (cell) {
       settingsCell = cell;
       break;
     }
   }
 
   // There should be a cell associated with this text field.
   DCHECK(settingsCell);
   return settingsCell;
 }
 
 }  // namespace
 
 @interface AutofillEditCollectionViewController ()<
     AutofillEditAccessoryDelegate> {
-  base::scoped_nsobject<AutofillEditCell> _currentEditingCell;
-  base::scoped_nsobject<AutofillEditAccessoryView> _accessoryView;
+  AutofillEditCell* _currentEditingCell;
+  AutofillEditAccessoryView* _accessoryView;
 }
 @end
 
 @implementation AutofillEditCollectionViewController
 
 - (instancetype)initWithStyle:(CollectionViewControllerStyle)style {
   self = [super initWithStyle:style];
   if (!self) {
     return nil;
   }
 
-  _accessoryView.reset(
-      [[AutofillEditAccessoryView alloc] initWithDelegate:self]);
+  _accessoryView = [[AutofillEditAccessoryView alloc] initWithDelegate:self];
   [self setShouldHideDoneButton:YES];
   [self updateEditButton];
   return self;
 }
 
 - (void)viewDidAppear:(BOOL)animated {
   [super viewDidAppear:animated];
   [[NSNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(keyboardDidShow)
              name:UIKeyboardDidShowNotification
            object:nil];
 }
 
 - (void)viewWillDisappear:(BOOL)animated {
   [super viewWillDisappear:animated];
   [[NSNotificationCenter defaultCenter]
       removeObserver:self
                 name:UIKeyboardDidShowNotification
               object:nil];
 }
 
 - (void)dealloc {
   [[NSNotificationCenter defaultCenter] removeObserver:self];
-  [super dealloc];
 }
 
 #pragma mark - SettingsRootCollectionViewController
 
 - (BOOL)shouldShowEditButton {
   return YES;
 }
 
 - (BOOL)editButtonEnabled {
   return YES;
@@ skipping 16 matching lines @@
       nextCellSection < [[self collectionView] numberOfSections])
     return [NSIndexPath indexPathForRow:0 inSection:nextCellSection];
 
   return nil;
 }
 
 #pragma mark - UITextFieldDelegate
 
 - (void)textFieldDidBeginEditing:(UITextField*)textField {
   AutofillEditCell* cell = AutofillEditCellForTextField(textField);
-  _currentEditingCell.reset([cell retain]);
+  _currentEditingCell = cell;
   [textField setInputAccessoryView:_accessoryView];
   [self updateAccessoryViewButtonState];
 }
 
 - (void)textFieldDidEndEditing:(UITextField*)textField {
   AutofillEditCell* cell = AutofillEditCellForTextField(textField);
   DCHECK(_currentEditingCell == cell);
   [textField setInputAccessoryView:nil];
-  _currentEditingCell.reset(nil);
+  _currentEditingCell = nil;
 }
 
 - (BOOL)textFieldShouldReturn:(UITextField*)textField {
   DCHECK([_currentEditingCell textField] == textField);
   [self nextPressed];
   return NO;
 }
 
 #pragma mark - AutofillEditAccessoryDelegate
 
@@ skipping 44 matching lines @@
 }
 
 #pragma mark - Keyboard handling
 
 - (void)keyboardDidShow {
   [self.collectionView scrollRectToVisible:[_currentEditingCell frame]
                                   animated:YES];
 }
 
 @end