[Offline pages] Removing static sync methods from Metadata SQL store's interface

components/offline_pages/offline_page_metadata_store_sql.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_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_SQL_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_SQL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 25 matching lines @@
   // Implementation methods.
   void GetOfflinePages(const LoadCallback& callback) override;
   void AddOrUpdateOfflinePage(const OfflinePageItem& offline_page,
                               const UpdateCallback& callback) override;
   void RemoveOfflinePages(const std::vector<int64_t>& offline_ids,
                           const UpdateCallback& callback) override;
   void Reset(const ResetCallback& callback) override;
   StoreState state() const override;
 
  private:
-  // Synchronous implementations, these are run on the background thread
-  // and actually do the work to access SQL.  The implementations above
-  // simply dispatch to the corresponding *Sync method on the background thread.
-  // 'runner' is where to run the callback.
-  static void AddOrUpdateOfflinePageSync(
-      const OfflinePageItem& offline_page,
-      sql::Connection* db,
-      scoped_refptr<base::SingleThreadTaskRunner> runner,
-      const UpdateCallback& callback);
-  static void RemoveOfflinePagesSync(
-      const std::vector<int64_t>& offline_ids,
-      sql::Connection* db,
-      scoped_refptr<base::SingleThreadTaskRunner> runner,
-      const UpdateCallback& callback);
-
   // Used to initialize DB connection.
   void OpenConnection();
   void OnOpenConnectionDone(StoreState state);
 
   // Used to reset DB connection.
   void OnResetDone(const ResetCallback& callback, StoreState state);
 
   // Helper function that checks whether a valid DB connection is present.
   // Returns true if valid connection is present, otherwise it returns false and
   // calls the provided callback as a shortcut.
   bool CheckDb(const base::Closure& callback);
 
   // Background thread where all SQL access should be run.
   scoped_refptr<base::SequencedTaskRunner> background_task_runner_;
 
   // Path to the database on disk.
   base::FilePath db_file_path_;
+
+  // Database connection.
   std::unique_ptr<sql::Connection> db_;
 
+  // State of the store.
   StoreState state_;
+
   base::WeakPtrFactory<OfflinePageMetadataStoreSQL> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageMetadataStoreSQL);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_METADATA_STORE_SQL_H_