[sync] Clean up path generation for the local sync database.

components/sync/driver/sync_service_base.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_SYNC_DRIVER_SYNC_SERVICE_BASE_H_
 #define COMPONENTS_SYNC_DRIVER_SYNC_SERVICE_BASE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 103 matching lines @@
   std::unique_ptr<SyncEngine> engine_;
 
   // The list of observers of the SyncService state.
   base::ObserverList<SyncServiceObserver> observers_;
 
   // Used to ensure that certain operations are performed on the thread that
   // this object was created on.
   base::ThreadChecker thread_checker_;
 
  private:
-  bool GetLocalSyncConfig(base::FilePath* local_sync_backend_folder) const;
 
   DISALLOW_COPY_AND_ASSIGN(SyncServiceBase);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_SYNC_SERVICE_BASE_H_