Remove dead code in HttpHeadersTests

spring-web/src/test/java/org/springframework/http/HttpHeadersTests.java

@@ -48,6 +48,7 @@ import static org.junit.Assert.*;
  * @author Sebastien Deleuze
  * @author Brian Clozel
  * @author Juergen Hoeller
+ * @author Sam Brannen
  */
 public class HttpHeadersTests {
 
@@ -515,10 +516,11 @@ public class HttpHeadersTests {
 		assertTrue(headers.getFirstZonedDateTime(HttpHeaders.DATE).isEqual(date));
 
 		headers.clear();
-		ZonedDateTime otherDate = ZonedDateTime.of(2010, 12, 18, 10, 20, 0, 0, ZoneId.of("GMT"));
 		headers.add(HttpHeaders.DATE, "Fri, 02 Jun 2017 02:22:00 GMT");
 		headers.add(HttpHeaders.DATE, "Sat, 18 Dec 2010 10:20:00 GMT");
 		assertTrue(headers.getFirstZonedDateTime(HttpHeaders.DATE).isEqual(date));
+		assertEquals(Arrays.asList("Fri, 02 Jun 2017 02:22:00 GMT",
+				"Sat, 18 Dec 2010 10:20:00 GMT"), headers.get(HttpHeaders.DATE));
 
 		// obsolete RFC 850 format
 		headers.clear();