Remove all ReadingList entries on managed account signout.

ios/chrome/browser/reading_list/reading_list_download_service.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_READING_LIST_READING_LIST_DOWNLOAD_SERVICE_H_
 #define IOS_CHROME_BROWSER_READING_LIST_READING_LIST_DOWNLOAD_SERVICE_H_
 
 #include "base/macros.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/reading_list/ios/reading_list_model_observer.h"
@@ skipping 26 matching lines @@
       base::FilePath chrome_profile_path,
       net::URLRequestContextGetter* url_request_context_getter,
       std::unique_ptr<dom_distiller::DistillerFactory> distiller_factory,
       std::unique_ptr<reading_list::ReadingListDistillerPageFactory>
           distiller_page_factory);
   ~ReadingListDownloadService() override;
 
   // Initializes the reading list download service.
   void Initialize();
 
+  // Clear the current download queue.
+  void Clear();
+
   // The root folder containing all the offline files.
   virtual base::FilePath OfflineRoot() const;
 
   // KeyedService implementation.
   void Shutdown() override;
 
   // ReadingListModelObserver implementation
   void ReadingListModelLoaded(const ReadingListModel* model) override;
   void ReadingListWillRemoveEntry(const ReadingListModel* model,
                                   const GURL& url) override;
@@ skipping 52 matching lines @@
   std::unique_ptr<reading_list::ReadingListDistillerPageFactory>
       distiller_page_factory_;
   std::unique_ptr<dom_distiller::DistillerFactory> distiller_factory_;
 
   base::WeakPtrFactory<ReadingListDownloadService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadingListDownloadService);
 };
 
 #endif  // IOS_CHROME_BROWSER_READING_LIST_READING_LIST_DOWNLOAD_SERVICE_H_