[ObjC ARC] Converts components/reading_list/ios:ios to ARC.

components/reading_list/ios/reading_list_model_bridge_observer.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 COMPONENTS_READING_LIST_IOS_READING_LIST_MODEL_BRIDGE_OBSERVER_H_
 #define COMPONENTS_READING_LIST_IOS_READING_LIST_MODEL_BRIDGE_OBSERVER_H_
 
 #import <Foundation/Foundation.h>
 
@@ skipping 57 matching lines @@
   void ReadingListWillAddEntry(const ReadingListModel* model,
                                const ReadingListEntry& entry) override;
   void ReadingListDidAddEntry(const ReadingListModel* model,
                               const GURL& url,
                               reading_list::EntrySource source) override;
   void ReadingListDidApplyChanges(ReadingListModel* model) override;
   void ReadingListWillUpdateEntry(const ReadingListModel* model,
                                   const GURL& url) override;
 
   __unsafe_unretained id<ReadingListModelBridgeObserver> observer_;
+
+  // TODO(crbug.com/729015): Refactor to remove the naked pointer.
   ReadingListModel* model_;  // weak
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListModelBridge);
 };
 
 #endif  // COMPONENTS_READING_LIST_IOS_READING_LIST_MODEL_BRIDGE_OBSERVER_H_