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

ios/chrome/browser/ui/history/history_entry_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_ENTRY_ITEM_H_
 #define IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_ENTRY_ITEM_H_
 
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 #import "ios/third_party/material_components_ios/src/components/Collections/src/MaterialCollections.h"
 
@@ skipping 57 matching lines @@
 // HistoryEntryItems are equal if they have the same URL and
 // timestamp.
 - (BOOL)isEqualToHistoryEntryItem:(HistoryEntryItem*)item;
 
 @end
 
 // Cell that renders a history entry.
 @interface HistoryEntryCell : MDCCollectionViewCell
 
 // View for displaying the favicon for the history entry.
-@property(nonatomic, retain) UIView* faviconViewContainer;
+@property(nonatomic, strong) UIView* faviconViewContainer;
 // Text label for history entry title.
-@property(nonatomic, readonly, retain) UILabel* textLabel;
+@property(nonatomic, readonly, strong) UILabel* textLabel;
 // Text label for history entry URL.
-@property(nonatomic, readonly, retain) UILabel* detailTextLabel;
+@property(nonatomic, readonly, strong) UILabel* detailTextLabel;
 // Text label for history entry timestamp.
-@property(nonatomic, readonly, retain) UILabel* timeLabel;
+@property(nonatomic, readonly, strong) UILabel* timeLabel;
 
 @end
 
 #endif  // IOS_CHROME_BROWSER_UI_HISTORY_HISTORY_ENTRY_ITEM_H_