Import cleaning.

web/src/main/java/org/springframework/security/web/authentication/session/SessionFixationProtectionStrategy.java

@@ -1,21 +1,15 @@
 package org.springframework.security.web.authentication.session;
 
-import java.util.Arrays;
-import java.util.Enumeration;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-import javax.servlet.http.HttpSession;
-
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.springframework.security.core.Authentication;
-import org.springframework.security.web.WebAttributes;
 import org.springframework.util.Assert;
 
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.util.*;
+
 /**
  * The default implementation of {@link SessionAuthenticationStrategy}.
  * <p>