message: Replace string with string_view.
diff: @@ -616,7 +616,7 @@ TEST(GroupEventsTest, BatchingSessionTest) {
  group_id = stat->IntValue();
  }
  EXPECT_TRUE(group_id.has_value());
  - std::string selected_group_ids;
  + absl::string_view selected_group_ids;
  if (absl::optional<XStatVisitor> stat =
  event.GetStat(StatType::kSelectedGroupIds)) {
  selected_group_ids = stat->StrOrRefValue();
  