Handle errors via AsyncListener

This is a limited backport of commit #e0678b mainly providing the fix without
exposing the onError callbacks.

Issue: SPR-16058

spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ResponseBodyEmitterTests.java

@@ -150,7 +150,6 @@ public class ResponseBodyEmitterTests {
 			// expected
 		}
 		verify(this.handler).send("foo", MediaType.TEXT_PLAIN);
-		verify(this.handler).completeWithError(failure);
 		verifyNoMoreInteractions(this.handler);
 	}