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

ios/chrome/browser/ui/history/history_search_view.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/history_search_view.h"
 
-#include "base/mac/objc_property_releaser.h"
 #include "components/strings/grit/components_strings.h"
 #include "ios/chrome/browser/ui/uikit_ui_util.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 search view.
 CGFloat kShadowOpacity = 0.2f;
 // Margin for the search view.
 CGFloat kHorizontalMargin = 16.0f;
 }  // namespace
 
-@interface HistorySearchView () {
-  base::mac::ObjCPropertyReleaser propertyReleaser_HistorySearchView_;
-}
+@interface HistorySearchView ()
 
 // Stack view for laying out the text field and cancel button.
 @property(nonatomic, strong) UIStackView* stackView;
 // Text field for the search view.
 @property(nonatomic, strong) UITextField* textField;
 // Cancel button for dismissing the search view.
 @property(nonatomic, strong) UIButton* cancelButton;
 // Constraint for the top anchor.
 @property(nonatomic, strong) NSLayoutConstraint* topAnchorConstraint;
 
@@ skipping 18 matching lines @@
         UIControlContentVerticalAlignmentCenter;
     _textField.backgroundColor = [UIColor whiteColor];
     _textField.textColor =
         [UIColor colorWithWhite:0 alpha:[MDCTypography body1FontOpacity]];
     _textField.font = [MDCTypography subheadFont];
     _textField.borderStyle = UITextBorderStyleNone;
     [_textField setLeftViewMode:UITextFieldViewModeNever];
     _textField.clearButtonMode = UITextFieldViewModeAlways;
     _textField.placeholder = l10n_util::GetNSString(IDS_HISTORY_SEARCH_BUTTON);
 
-    _cancelButton = [[UIButton buttonWithType:UIButtonTypeCustom] retain];
+    _cancelButton = [UIButton buttonWithType:UIButtonTypeCustom];
     [_cancelButton setImage:[UIImage imageNamed:@"collapse"]
                    forState:UIControlStateNormal];
     [_cancelButton setImage:[UIImage imageNamed:@"collapse_pressed"]
                    forState:UIControlStateHighlighted];
     [_cancelButton
         setContentCompressionResistancePriority:UILayoutPriorityRequired
                                         forAxis:
                                             UILayoutConstraintAxisHorizontal];
     [_cancelButton setContentHuggingPriority:UILayoutPriorityRequired
                                      forAxis:UILayoutConstraintAxisHorizontal];
     [_cancelButton setAccessibilityLabel:l10n_util::GetNSString(IDS_CANCEL)];
 
     _stackView = [[UIStackView alloc]
         initWithArrangedSubviews:@[ _textField, _cancelButton ]];
     _stackView.alignment = UIStackViewAlignmentFill;
     _stackView.axis = UILayoutConstraintAxisHorizontal;
     _stackView.distribution = UIStackViewDistributionFill;
     [self addSubview:_stackView];
     _stackView.translatesAutoresizingMaskIntoConstraints = NO;
     _stackView.layoutMarginsRelativeArrangement = YES;
 
     CGFloat topAnchorConstant = IsCompact() ? StatusBarHeight() : 0;
-    _topAnchorConstraint = [[_stackView.topAnchor
-        constraintEqualToAnchor:self.topAnchor
-                       constant:topAnchorConstant] retain];
+    _topAnchorConstraint =
+        [_stackView.topAnchor constraintEqualToAnchor:self.topAnchor
+                                             constant:topAnchorConstant];
     [NSLayoutConstraint activateConstraints:@[
       _topAnchorConstraint,
       [_stackView.bottomAnchor constraintEqualToAnchor:self.bottomAnchor],
       [_stackView.layoutMarginsGuide.leadingAnchor
           constraintEqualToAnchor:self.leadingAnchor
                          constant:kHorizontalMargin],
       [_stackView.layoutMarginsGuide.trailingAnchor
           constraintEqualToAnchor:self.trailingAnchor
                          constant:-kHorizontalMargin],
     ]];
-
-    propertyReleaser_HistorySearchView_.Init(self, [HistorySearchView class]);
   }
   return self;
 }
 
 - (BOOL)becomeFirstResponder {
   return [self.textField becomeFirstResponder];
 }
 
 - (void)setEnabled:(BOOL)enabled {
   _enabled = enabled;
@@ skipping 17 matching lines @@
   self.textField.text = nil;
 }
 
 #pragma mark - UITraitEnvironment
 
 - (void)traitCollectionDidChange:(UITraitCollection*)previousTraitCollection {
   self.topAnchorConstraint.constant = IsCompact() ? StatusBarHeight() : 0;
 }
 
 @end