HADOOP-659. Fix an inconsistency in the earlier patch that caused TestCopyFiles to fail. Contributed by Hairong.

git-svn-id: https://svn.apache.org/repos/asf/lucene/hadoop/trunk@500023 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/hadoop/dfs/FSNamesystem.java

@@ -454,7 +454,7 @@ class FSNamesystem implements FSConstants {
                 }
                 
                 public void remove() {
-                    throw new UnsupportedOperationException();
+                    iterator[level].remove();
                 }
             };
         }