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

ios/chrome/browser/ui/history/history_entries_status_item.h

 // 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.
 
 #ifndef IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_ENTRIES_STATUS_ITEM_H_
 #define IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_ENTRIES_STATUS_ITEM_H_
 
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_footer_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 
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 // Model item for HistoryEntriesStatusCell. Manages links added to the cell.
 @interface HistoryEntriesStatusItem : CollectionViewItem
 // Status of currently displayed history entries.
 @property(nonatomic, assign) HistoryEntriesStatus entriesStatus;
 // YES if messages should be hidden.
 @property(nonatomic, assign, getter=isHidden) BOOL hidden;
 // YES if message for other forms of browsing data should be shown.
 @property(nonatomic, assign) BOOL showsOtherBrowsingDataNotice;
 // Delegate for HistoryEntriesStatusItem. Is notified when a link is pressed.
-@property(nonatomic, assign) id<HistoryEntriesStatusItemDelegate> delegate;
+@property(nonatomic, weak) id<HistoryEntriesStatusItemDelegate> delegate;
 @end
 
 // Cell for displaying status for history entry. Provides information on whether
 // local or synced entries or displays, and how to access other forms of
 // browsing history, if applicable.
 @interface HistoryEntriesStatusCell : CollectionViewFooterCell
 @end
 
 @interface HistoryEntriesStatusCell (Testing)
 // Link controller for entries status message.
 @property(nonatomic, retain, readonly) LabelLinkController* labelLinkController;
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_ENTRIES_STATUS_ITEM_H_