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

ios/chrome/browser/ui/history/clear_browsing_bar.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/history/clear_browsing_bar.h"
 
 #include "base/logging.h"
-#include "base/mac/objc_property_releaser.h"
 #include "components/strings/grit/components_strings.h"
 #include "ios/chrome/browser/ui/rtl_geometry.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.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"
 #include "ui/base/l10n/l10n_util_mac.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 namespace {
 // Shadow opacity for the clear browsing bar.
 CGFloat kShadowOpacity = 0.2f;
 // Horizontal margin for the contents of ClearBrowsingBar.
 CGFloat kHorizontalMargin = 8.0f;
 // Enum to specify button position in the clear browsing bar.
 typedef NS_ENUM(BOOL, ButtonPlacement) { Leading, Trailing };
 }  // namespace
 
-@interface ClearBrowsingBar () {
-  base::mac::ObjCPropertyReleaser propertyReleaser_ClearBrowsingBar_;
-}
+@interface ClearBrowsingBar ()
 
 // Button that displays "Clear Browsing Data...".
 @property(nonatomic, strong) UIButton* clearBrowsingDataButton;
 // Button that displays "Edit".
 @property(nonatomic, strong) UIButton* editButton;
 // Button that displays "Delete".
 @property(nonatomic, strong) UIButton* deleteButton;
 // Button that displays "Cancel".
 @property(nonatomic, strong) UIButton* cancelButton;
 // Stack view for arranging the buttons.
@@ skipping 11 matching lines @@
 @synthesize editing = _editing;
 @synthesize clearBrowsingDataButton = _clearBrowsingDataButton;
 @synthesize editButton = _editButton;
 @synthesize deleteButton = _deleteButton;
 @synthesize cancelButton = _cancelButton;
 @synthesize stackView = _stackView;
 
 - (instancetype)initWithFrame:(CGRect)frame {
   self = [super initWithFrame:frame];
   if (self) {
-    _clearBrowsingDataButton =
-        [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    _clearBrowsingDataButton = [UIButton buttonWithType:UIButtonTypeCustom];
     [_clearBrowsingDataButton
         setTitle:l10n_util::GetNSStringWithFixup(
                      IDS_HISTORY_OPEN_CLEAR_BROWSING_DATA_DIALOG)
         forState:UIControlStateNormal];
     [self styleButton:_clearBrowsingDataButton forPlacement:Leading];
 
-    _editButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    _editButton = [UIButton buttonWithType:UIButtonTypeCustom];
     [_editButton
         setTitle:l10n_util::GetNSString(IDS_HISTORY_START_EDITING_BUTTON)
         forState:UIControlStateNormal];
     [self styleButton:_editButton forPlacement:Trailing];
 
-    _deleteButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    _deleteButton = [UIButton buttonWithType:UIButtonTypeCustom];
     [_deleteButton setTitle:l10n_util::GetNSString(
                                 IDS_HISTORY_DELETE_SELECTED_ENTRIES_BUTTON)
                    forState:UIControlStateNormal];
     [self styleButton:_deleteButton forPlacement:Leading];
 
-    _cancelButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    _cancelButton = [UIButton buttonWithType:UIButtonTypeCustom];
     [_cancelButton
         setTitle:l10n_util::GetNSString(IDS_HISTORY_CANCEL_EDITING_BUTTON)
         forState:UIControlStateNormal];
     [self styleButton:_cancelButton forPlacement:Trailing];
 
     _stackView = [[UIStackView alloc] initWithArrangedSubviews:@[
       _clearBrowsingDataButton, _editButton, _deleteButton, _cancelButton
     ]];
     _stackView.alignment = UIStackViewAlignmentFill;
     _stackView.distribution = UIStackViewDistributionEqualSpacing;
     _stackView.axis = UILayoutConstraintAxisHorizontal;
 
     [self addSubview:_stackView];
     _stackView.translatesAutoresizingMaskIntoConstraints = NO;
     _stackView.layoutMarginsRelativeArrangement = YES;
     [NSLayoutConstraint activateConstraints:@[
       [_stackView.layoutMarginsGuide.leadingAnchor
           constraintEqualToAnchor:self.leadingAnchor
                          constant:kHorizontalMargin],
       [_stackView.layoutMarginsGuide.trailingAnchor
           constraintEqualToAnchor:self.trailingAnchor
                          constant:-kHorizontalMargin],
       [_stackView.topAnchor constraintEqualToAnchor:self.topAnchor],
       [_stackView.bottomAnchor constraintEqualToAnchor:self.bottomAnchor],
     ]];
 
     [self setBackgroundColor:[UIColor whiteColor]];
     [[self layer] setShadowOpacity:kShadowOpacity];
     [self setEditing:NO];
-    propertyReleaser_ClearBrowsingBar_.Init(self, [ClearBrowsingBar class]);
   }
   return self;
 }
 
 #pragma mark Public Methods
 
 - (void)setEditing:(BOOL)editing {
   _editing = editing;
   self.clearBrowsingDataButton.hidden = editing;
   self.editButton.hidden = editing;
@@ skipping 53 matching lines @@
                forState:UIControlStateDisabled];
   [[button titleLabel]
       setFont:[[MDCTypography fontLoader] regularFontOfSize:14]];
   button.contentHorizontalAlignment =
       leading ^ UseRTLLayout() ? UIControlContentHorizontalAlignmentLeft
                                : UIControlContentHorizontalAlignmentRight;
   [button setTranslatesAutoresizingMaskIntoConstraints:NO];
 }
 
 @end