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

ios/chrome/browser/ui/history/history_entries_status_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/history/history_entries_status_item.h"
 
-#include "base/ios/weak_nsobject.h"
 #include "base/mac/foundation_util.h"
-#import "base/mac/objc_property_releaser.h"
 #include "components/strings/grit/components_strings.h"
 #include "ios/chrome/browser/chrome_url_constants.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_footer_item.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
 #import "ios/chrome/browser/ui/util/label_link_controller.h"
 #import "ios/chrome/common/string_util.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "url/gurl.h"
 
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
 // Delegate for HistoryEntriesStatusCell.
 @protocol HistoryEntriesStatusCellDelegate<NSObject>
 // Notifies the delegate that |URL| should be opened.
 - (void)historyEntriesStatusCell:(HistoryEntriesStatusCell*)cell
                didRequestOpenURL:(const GURL&)URL;
 @end
 
-@interface HistoryEntriesStatusCell () {
-  // Property releaser for HistoryEntriesStatusItem.
-  base::mac::ObjCPropertyReleaser _propertyReleaser_HistoryEntriesStatusCell;
-  // Delegate for the HistoryEntriesStatusCell. Is notified when a link is
-  // tapped.
-  base::WeakNSProtocol<id<HistoryEntriesStatusCellDelegate>> _delegate;
-}
+@interface HistoryEntriesStatusCell ()
 // Redeclare as readwrite.
-@property(nonatomic, retain, readwrite)
+@property(nonatomic, strong, readwrite)
     LabelLinkController* labelLinkController;
 // Delegate for the HistoryEntriesStatusCell. Is notified when a link is
 // tapped.
-@property(nonatomic, assign) id<HistoryEntriesStatusCellDelegate> delegate;
+// Delegate for the HistoryEntriesStatusCell. Is notified when a link is
+// tapped.
+@property(nonatomic, weak) id<HistoryEntriesStatusCellDelegate> delegate;
 // Sets links on the cell label.
 - (void)setLinksForSyncURL:(const GURL&)syncURL
            browsingDataURL:(const GURL&)browsingDataURL;
 @end
 
-@interface HistoryEntriesStatusItem ()<HistoryEntriesStatusCellDelegate> {
-  // Delegate for the HistoryEntriesStatusItem. Is notified when a link is
-  // tapped.
-  base::WeakNSProtocol<id<HistoryEntriesStatusItemDelegate>> _delegate;
-}
+@interface HistoryEntriesStatusItem ()<HistoryEntriesStatusCellDelegate>
 @end
 
 @implementation HistoryEntriesStatusItem
-
+@synthesize delegate = _delegate;
 @synthesize entriesStatus = _entriesStatus;
 @synthesize hidden = _hidden;
 @synthesize showsOtherBrowsingDataNotice = _showsOtherBrowsingDataNotice;
 
 - (instancetype)initWithType:(NSInteger)type {
   self = [super initWithType:type];
   if (self) {
     _entriesStatus = NO_ENTRIES;
     _hidden = NO;
     _showsOtherBrowsingDataNotice = NO;
@@ skipping 40 matching lines @@
         l10n_util::GetNSString(IDS_IOS_HISTORY_OTHER_FORMS_OF_HISTORY);
     text = [NSString stringWithFormat:@"%@ %@", text, otherBrowsingNotice];
     otherBrowsingDataURL = GURL(kHistoryMyActivityURL);
   }
 
   cell.textLabel.text = text;
   [cell setLinksForSyncURL:syncLearnMoreURL
            browsingDataURL:otherBrowsingDataURL];
 }
 
-- (void)setDelegate:(id<HistoryEntriesStatusItemDelegate>)delegate {
-  _delegate.reset(delegate);
-}
-
-- (id<HistoryEntriesStatusItemDelegate>)delegate {
-  return _delegate;
-}
-
 - (void)historyEntriesStatusCell:(HistoryEntriesStatusCell*)cell
                didRequestOpenURL:(const GURL&)URL {
   [self.delegate historyEntriesStatusItem:self didRequestOpenURL:URL];
 }
 
 - (BOOL)isEqualToHistoryEntriesStatusItem:(HistoryEntriesStatusItem*)object {
   return self.entriesStatus == object.entriesStatus &&
          self.hidden == object.hidden &&
          self.showsOtherBrowsingDataNotice == self.showsOtherBrowsingDataNotice;
 }
 
 - (BOOL)isEqual:(id)object {
   if (self == object) {
     return YES;
   }
   if (![object isKindOfClass:[HistoryEntriesStatusItem class]]) {
     return NO;
   }
   return [self
       isEqualToHistoryEntriesStatusItem:base::mac::ObjCCastStrict<
                                             HistoryEntriesStatusItem>(object)];
 }
 
 @end
 
 @implementation HistoryEntriesStatusCell
-
+@synthesize delegate = _delegate;
 @synthesize labelLinkController = _labelLinkController;
 
-- (instancetype)initWithFrame:(CGRect)frame {
-  self = [super initWithFrame:frame];
-  if (self) {
-    _propertyReleaser_HistoryEntriesStatusCell.Init(
-        self, [HistoryEntriesStatusCell class]);
-  }
-  return self;
-}
-
 - (void)setLinksForSyncURL:(const GURL&)syncURL
            browsingDataURL:(const GURL&)browsingDataURL {
-  base::WeakNSObject<HistoryEntriesStatusCell> weakSelf(self);
-  self.labelLinkController = [[[LabelLinkController alloc]
+  __weak HistoryEntriesStatusCell* weakSelf = self;
+  self.labelLinkController = [[LabelLinkController alloc]
       initWithLabel:self.textLabel
              action:^(const GURL& URL) {
                [[weakSelf delegate] historyEntriesStatusCell:weakSelf
                                            didRequestOpenURL:URL];
-             }] autorelease];
+             }];
   [self.labelLinkController setLinkColor:[[MDCPalette cr_bluePalette] tint500]];
 
   // Remove link delimiters from text and get ranges for links. Both links
   // must be parsed before being added to the controller because modifying the
   // label text clears all added links.
   // The sync URL, if present, will always come before the browsing data URL,
   // if present.
   NSRange syncRange;
   if (syncURL.is_valid()) {
     self.textLabel.text = ParseStringWithLink(self.textLabel.text, &syncRange);
     DCHECK(syncRange.location != NSNotFound && syncRange.length);
   }
   NSRange otherBrowsingDataRange;
   if (browsingDataURL.is_valid()) {
     self.textLabel.text =
         ParseStringWithLink(self.textLabel.text, &otherBrowsingDataRange);
     DCHECK(otherBrowsingDataRange.location != NSNotFound &&
            otherBrowsingDataRange.length);
   }
   // Add links to the cell.
   if (syncURL.is_valid()) {
     [self.labelLinkController addLinkWithRange:syncRange url:syncURL];
   }
   if (browsingDataURL.is_valid()) {
     [self.labelLinkController addLinkWithRange:otherBrowsingDataRange
                                            url:browsingDataURL];
   }
 }
 
-- (void)setDelegate:(id<HistoryEntriesStatusCellDelegate>)delegate {
-  _delegate.reset(delegate);
-}
-
-- (id<HistoryEntriesStatusCellDelegate>)delegate {
-  return _delegate;
-}
-
 - (void)prepareForReuse {
   [super prepareForReuse];
   self.labelLinkController = nil;
   self.delegate = nil;
 }
 
 @end