Fixes a DCHECK in tools_menu_button_observer_bridge during tests

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 18 matching lines @@
 - (void)readingListModel:(const ReadingListModel*)model
             willAddEntry:(const ReadingListEntry&)entry;
 
 - (void)readingListModel:(const ReadingListModel*)model
              didAddEntry:(const GURL&)url
              entrySource:(reading_list::EntrySource)source;
 
 - (void)readingListModelBeganBatchUpdates:(const ReadingListModel*)model;
 - (void)readingListModelCompletedBatchUpdates:(const ReadingListModel*)model;
 
+- (void)readingListModelBeingShutdown:(const ReadingListModel*)model;
 - (void)readingListModelBeingDeleted:(const ReadingListModel*)model;
 
 - (void)readingListModel:(const ReadingListModel*)model
          willUpdateEntry:(const GURL&)url;
 
 @end
 
 // Observer for the Reading List model that translates all the callbacks to
 // Objective-C calls.
 class ReadingListModelBridge : public ReadingListModelObserver {
  public:
   explicit ReadingListModelBridge(id<ReadingListModelBridgeObserver> observer,
                                   ReadingListModel* model);
   ~ReadingListModelBridge() override;
 
  private:
   void ReadingListModelBeganBatchUpdates(
       const ReadingListModel* model) override;
 
   void ReadingListModelCompletedBatchUpdates(
       const ReadingListModel* model) override;
   void ReadingListModelLoaded(const ReadingListModel* model) override;
+  void ReadingListModelBeingShutdown(const ReadingListModel* model) override;
   void ReadingListModelBeingDeleted(const ReadingListModel* model) override;
   void ReadingListWillRemoveEntry(const ReadingListModel* model,
                                   const GURL& url) override;
   void ReadingListWillMoveEntry(const ReadingListModel* model,
                                 const GURL& url) override;
   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_;
   ReadingListModel* model_;  // weak
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListModelBridge);
 };
 
 #endif  // COMPONENTS_READING_LIST_IOS_READING_LIST_MODEL_BRIDGE_OBSERVER_H_