[SyncFS] Expand simple functions to their caller in drive_backend/

chrome/browser/sync_file_system/drive_backend/folder_creator.h

Index: chrome/browser/sync_file_system/drive_backend/folder_creator.h
diff --git a/chrome/browser/sync_file_system/drive_backend/folder_creator.h b/chrome/browser/sync_file_system/drive_backend/folder_creator.h
index cafa511126ce14d5eb57485681aeab409f6b11c2..2c832a35c0e4a373fafc9508a3049ee6e1c4d627 100644
--- a/chrome/browser/sync_file_system/drive_backend/folder_creator.h
+++ b/chrome/browser/sync_file_system/drive_backend/folder_creator.h
@@ -50,9 +50,6 @@ class FolderCreator {
                       ScopedVector<google_apis::FileResource> candidates,
                       google_apis::GDataErrorCode error,
                       scoped_ptr<google_apis::FileList> file_list);
-  void DidUpdateDatabase(const std::string& file_id,
-                         const FileIDCallback& callback,
-                         SyncStatusCode status);
 
   drive::DriveServiceInterface* drive_service_;
   MetadataDatabase* metadata_database_;