[Sync] Stop deleting LevelDB files when deleting Directory

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 58 matching lines @@
   // email address.
   const std::unique_ptr<SigninManagerWrapper> signin_;
 
   // The product channel of the embedder.
   const version_info::Channel channel_;
 
   // The path to the base directory under which sync should store its
   // information.
   const base::FilePath base_directory_;
 
-  // The full path to the sync data directory.
-  const base::FilePath directory_path_;
+  // The full path to the sync data folder. The folder is not fully deleted when
+  // sync is disabled, since it holds both Directory and ModelTypeStore data.
+  // Directory files will be selectively targeted instead.
+  const base::FilePath sync_data_folder_;
 
   // An identifier representing this instance for debugging purposes.
   const std::string debug_identifier_;
 
   // The class that handles getting, setting, and persisting sync
   // preferences.
   SyncPrefs sync_prefs_;
 
   // The thread where all the sync operations happen. This thread is kept alive
   // until browser shutdown and reused if sync is turned off and on again. It is
   // joined during the shutdown process, but there is an abort mechanism in
   // place to prevent slow HTTP requests from blocking browser shutdown.
   std::unique_ptr<base::Thread> sync_thread_;
 
   // Our asynchronous engine to communicate with sync components living on
   // other threads.
   std::unique_ptr<SyncEngine> engine_;
 
  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_