Fix bogus import.

Author: garyrussell

spring-kafka/src/main/java/org/springframework/kafka/listener/DeadLetterPublishingRecoverer.java

@@ -46,7 +46,6 @@
 import org.springframework.kafka.KafkaException;
 import org.springframework.kafka.core.KafkaOperations;
 import org.springframework.kafka.core.ProducerFactory;
-import org.springframework.kafka.listener.DeadLetterPublishingRecoverer.HeaderNames.HeadersToAdd;
 import org.springframework.kafka.support.KafkaHeaders;
 import org.springframework.kafka.support.KafkaUtils;
 import org.springframework.kafka.support.SendResult;
@@ -673,7 +672,7 @@ private void maybeAddOriginalHeaders(Headers kafkaHeaders, ConsumerRecord<?, ?>
 		}
 	}
 
-	private void maybeAddHeader(Headers kafkaHeaders, String header, byte[] value, HeadersToAdd hta) {
+	private void maybeAddHeader(Headers kafkaHeaders, String header, byte[] value, HeaderNames.HeadersToAdd hta) {
 		if (this.whichHeaders.contains(hta)
 				&& (this.appendOriginalHeaders || kafkaHeaders.lastHeader(header) == null)) {
 			kafkaHeaders.add(header, value);
@@ -705,7 +704,7 @@ private void addExceptionInfoHeaders(Headers kafkaHeaders, Exception exception,
 				HeaderNames.HeadersToAdd.EX_STACKTRACE);
 	}
 
-	private void appendOrReplace(Headers headers, RecordHeader header, HeadersToAdd hta) {
+	private void appendOrReplace(Headers headers, RecordHeader header, HeaderNames.HeadersToAdd hta) {
 		if (this.whichHeaders.contains(hta)) {
 			if (this.stripPreviousExceptionHeaders) {
 				headers.remove(header.key());