[SyncFS] Simplify MetadataDatabase::Create

chrome/browser/sync_file_system/drive_backend/metadata_database.h

 // Copyright 2013 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 CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 334 matching lines @@
   // Sets |app_ids| to a list of all registered app ids.
   void GetRegisteredAppIDs(std::vector<std::string>* app_ids);
 
   // Clears dirty flag of trackers that can be cleared without external
   // interactien.
   void SweepDirtyTrackers(const std::vector<std::string>& file_ids,
                           const SyncStatusCallback& callback);
 
  private:
   friend class MetadataDatabaseTest;
-  struct CreateParam;
 
-  MetadataDatabase(
-      const base::FilePath& database_path,
-      bool enable_on_disk_index,
-      leveldb::Env* env_override);
-  static void CreateOnWorkerTaskRunner(
-      scoped_ptr<CreateParam> create_param,
-      const CreateCallback& callback);
+  MetadataDatabase(const base::FilePath& database_path,
+                   bool enable_on_disk_index,
+                   leveldb::Env* env_override);
   SyncStatusCode Initialize();
 
   // Database manipulation methods.
   void RegisterTrackerAsAppRoot(const std::string& app_id,
                                 int64 tracker_id);
 
   void CreateTrackerForParentAndFileID(const FileTracker& parent_tracker,
                                        const std::string& file_id);
   void CreateTrackerForParentAndFileMetadata(const FileTracker& parent_tracker,
                                              const FileMetadata& file_metadata,
@@ skipping 49 matching lines @@
 
   base::WeakPtrFactory<MetadataDatabase> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MetadataDatabase);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_H_