message: Belated fixes for PR 2190
diff: @@ -150,7 +150,7 @@ TEST_F(LdsApiTest, Basic) {
  setup();
  - std::string response1_json = R"EOF(
  + const std::string response1_json = R"EOF(
  {
  "listeners": [
  {
  @@ -183,7 +183,7 @@ TEST_F(LdsApiTest, Basic) {
  expectRequest();
  interval_timer_->callback_();
  - std::string response2_json = R"EOF(
  + const std::string response2_json = R"EOF(
  {
  "listeners": [
  {
  @@ -297,7 +297,7 @@ TEST_F(LdsApiTest, Failure) {
  setup();
  - std::string response_json = R"EOF(
  + const std::string response_json = R"EOF(
  {
  "listeners" : {}
  }
  