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

ios/chrome/browser/ui/tools_menu/reading_list_menu_view_item.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.
 
 #import "ios/chrome/browser/ui/tools_menu/reading_list_menu_view_item.h"
 
 #include "base/mac/foundation_util.h"
-#import "base/mac/scoped_nsobject.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
 #import "ios/chrome/browser/ui/reading_list/number_badge_view.h"
 #import "ios/third_party/material_components_ios/src/components/Palettes/src/MaterialPalettes.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // ID for cell reuse
 static NSString* const kReadingListCellID = @"ReadingListCellID";
 const CGFloat kToolsMenuItemTrailingMargin = 25;
 }  // namespace
 
 @interface ReadingListMenuViewCell () {
-  base::scoped_nsobject<NumberBadgeView> _badge;
+  NumberBadgeView* _badge;
 }
 @end
 
 @implementation ReadingListMenuViewItem
 
 + (NSString*)cellID {
   return kReadingListCellID;
 }
 
 + (Class)cellClass {
   return [ReadingListMenuViewCell class];
 }
 
 @end
 
 @implementation ReadingListMenuViewCell
 
 - (void)initializeViews {
   if (_badge && [self title]) {
     return;
   }
 
   [super initializeViews];
 
-  _badge.reset([[NumberBadgeView alloc] initWithFrame:CGRectZero]);
+  _badge = [[NumberBadgeView alloc] initWithFrame:CGRectZero];
   [_badge setTranslatesAutoresizingMaskIntoConstraints:NO];
   [self.contentView addSubview:_badge];
 
   [self.contentView removeConstraints:self.contentView.constraints];
 
   NSMutableArray<NSLayoutConstraint*>* constraintsToApply = [NSMutableArray
       arrayWithArray:[NSLayoutConstraint
                          constraintsWithVisualFormat:
                              @"H:|-(margin)-[title]-[badge]-(endMargin)-|"
                          options:NSLayoutFormatDirectionLeadingToTrailing
                          metrics:@{
                            @"margin" : @(self.horizontalMargin),
                            @"endMargin" : @(kToolsMenuItemTrailingMargin)
                          }
                          views:@{
                            @"title" : self.title,
                            @"badge" : _badge
                          }]];
   [constraintsToApply
       addObject:[self.title.centerYAnchor
                     constraintEqualToAnchor:self.contentView.centerYAnchor]];
   [constraintsToApply
-      addObject:[_badge.get().centerYAnchor
+      addObject:[_badge.centerYAnchor
                     constraintEqualToAnchor:self.contentView.centerYAnchor]];
 
   [NSLayoutConstraint activateConstraints:constraintsToApply];
 }
 
 - (void)updateBadgeCount:(NSInteger)count animated:(BOOL)animated {
   [_badge setNumber:count animated:animated];
 }
 
 - (void)updateSeenState:(BOOL)hasUnseenItems animated:(BOOL)animated {
   if (hasUnseenItems) {
     UIColor* highlightedColor = [[MDCPalette cr_bluePalette] tint500];
 
     [_badge setBackgroundColor:highlightedColor animated:animated];
     [self.title setTextColor:highlightedColor];
   } else {
     UIColor* regularColor = [[MDCPalette greyPalette] tint500];
 
     [_badge setBackgroundColor:regularColor animated:animated];
     [self.title setTextColor:[UIColor blackColor]];
   }
 }
 
 @end