message: Fix breakage in OSS build when tstring is enabled.
diff: @@ -749,7 +749,7 @@ class SnapshotDatasetOp : public UnaryDatasetOpKernel {
  // Get all the files in the run_dir.
  std::vector<std::string> filenames_str;
  TF_RETURN_IF_ERROR(ctx->env()->GetMatchingPaths(
  - absl::StrCat(run_dir_, "/*"), &filenames_str));
  + absl::StrCat(absl::string_view(run_dir_), "/*"), &filenames_str));
  filenames_.resize(filenames_str.size());
  std::copy(filenames_str.begin(), filenames_str.end(),
  filenames_.begin());
  @@ -973,7 +973,7 @@ class SnapshotDatasetOp : public UnaryDatasetOpKernel {
  }
  }
  #if !defined(PLATFORM_GOOGLE)
  - string record_bytes;
  + tstring record_bytes;
  Status s = reader->ReadRecord(&record_bytes);
  #else
  absl::Cord record_cord;
  