Fix Checkstyle violation

Author: sbrannen

spring-webmvc/src/main/java/org/springframework/web/servlet/view/RedirectView.java

@@ -23,7 +23,6 @@
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.regex.Matcher;