* `StoreAsLevelDbTable` takes a `tsl::WritableFile file` instead of `const std::string& filename` as a parameter to make it easy to test
* `StoreAsLevelDbTable` takes a `tsl::WritableFile file` instead of `const std::string& filename` as a parameter to make it easy to test
* `DoStoreAsLevelDbTable` takes a `tsl::WritableFile file` instead of `const std::string& filename` as a parameter to make it easy to test
