XhrTransport implementations do not need to redeclare interface when extending from AbstractXhrTransport

(cherry picked from commit df0b26f)

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/client/JettyXhrTransport.java

@@ -44,7 +44,6 @@ import org.springframework.web.socket.sockjs.SockJsException;
 import org.springframework.web.socket.sockjs.SockJsTransportFailureException;
 import org.springframework.web.socket.sockjs.frame.SockJsFrame;
 
-
 /**
  * An XHR transport based on Jetty's {@link org.eclipse.jetty.client.HttpClient}.
  *
@@ -61,7 +60,7 @@ import org.springframework.web.socket.sockjs.frame.SockJsFrame;
  * @author Rossen Stoyanchev
  * @since 4.1
  */
-public class JettyXhrTransport extends AbstractXhrTransport implements XhrTransport, Lifecycle {
+public class JettyXhrTransport extends AbstractXhrTransport implements Lifecycle {
 
 	private final HttpClient httpClient;
 
@@ -105,6 +104,7 @@ public class JettyXhrTransport extends AbstractXhrTransport implements XhrTransp
 		return this.httpClient.isRunning();
 	}
 
+
 	@Override
 	protected ResponseEntity<String> executeInfoRequestInternal(URI infoUrl) {
 		return executeRequest(infoUrl, HttpMethod.GET, getRequestHeaders(), null);

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/client/RestTemplateXhrTransport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -50,7 +50,7 @@ import org.springframework.web.socket.sockjs.frame.SockJsFrame;
  * @author Rossen Stoyanchev
  * @since 4.1
  */
-public class RestTemplateXhrTransport extends AbstractXhrTransport implements XhrTransport {
+public class RestTemplateXhrTransport extends AbstractXhrTransport {
 
 	private final RestOperations restTemplate;
 

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/client/UndertowXhrTransport.java

@@ -85,7 +85,7 @@ import org.springframework.web.socket.sockjs.frame.SockJsFrame;
  * @since 4.1.2
  * @see org.xnio.Options
  */
-public class UndertowXhrTransport extends AbstractXhrTransport implements XhrTransport {
+public class UndertowXhrTransport extends AbstractXhrTransport {
 
 	private static final AttachmentKey<String> RESPONSE_BODY = AttachmentKey.create(String.class);