message: Restore escaping to string attribute list summaries accidentally removed by previous change.
diff: @@ -89,7 +89,7 @@ string SummarizeAttrValue(const AttrValue& attr_value) {
  std::vector<string> pieces;
  if (attr_value.list().s_size() > 0) {
  for (int i = 0; i < attr_value.list().s_size(); ++i) {
  - pieces.push_back(attr_value.list().s(i));
  + pieces.push_back(SummarizeString(attr_value.list().s(i)));
  }
  } else if (attr_value.list().i_size() > 0) {
  for (int i = 0; i < attr_value.list().i_size(); ++i) {
  