polish - removing unused import

git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@2245 50f2f4bb-b051-0410-bef5-90022cba6387

org.springframework.web.servlet/src/main/java/org/springframework/web/servlet/tags/UrlTag.java

@@ -16,7 +16,6 @@
 
 package org.springframework.web.servlet.tags;
 
-import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
 import java.net.URLEncoder;