[SyncFS] Simplify MetadataDatabase::Create

chrome/browser/sync_file_system/drive_backend/metadata_database.h

Index: chrome/browser/sync_file_system/drive_backend/metadata_database.h
diff --git a/chrome/browser/sync_file_system/drive_backend/metadata_database.h b/chrome/browser/sync_file_system/drive_backend/metadata_database.h
index 6c527b902ad72323f487c08122da66e4e98cb4a4..8362f44e31d553225201244b65ed51619d884020 100644
--- a/chrome/browser/sync_file_system/drive_backend/metadata_database.h
+++ b/chrome/browser/sync_file_system/drive_backend/metadata_database.h
@@ -352,15 +352,10 @@ class MetadataDatabase {
 
  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.