message: Fix stack-use-after-scope introduced by cl/464505510
  Not a production issue.
diff: @@ -2283,6 +2283,7 @@ TEST_F(SessionTest, UndoForSingleSegment) {
  commands::Command command;
  Segments segments;
  + config::Config config;
  { // Create segments
  InsertCharacterChars("aiueo", &session, &command);
  @@ -2367,7 +2368,6 @@ TEST_F(SessionTest, UndoForSingleSegment) {
  EXPECT_FALSE(command.output().has_preedit());
  EXPECT_RESULT("aiueo", command);
  - config::Config config;
  config.set_session_keymap(config::Config::MSIME);
  session.SetConfig(&config);
  