Changed to extend non-deprecated, now-concrete DescriptiveStatistics.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@600369 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/math/stat/descriptive/SynchronizedDescriptiveStatistics.java

@@ -29,7 +29,7 @@ package org.apache.commons.math.stat.descriptive;
  * @since 1.2
  * @version $Revision$ $Date$
  */
-public class SynchronizedDescriptiveStatistics extends DescriptiveStatisticsImpl {
+public class SynchronizedDescriptiveStatistics extends DescriptiveStatistics {
 
     /** Serialization UID */
     private static final long serialVersionUID = 1L;