Revert "fix CHANGES.txt"

This reverts commit 3c0204a5866520e74917b26b6ac2061650a5bb6d.

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -2201,6 +2201,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9332. Fix Precondition failures from NameNodeEditLogRoller while
     saving namespace. (wang)
 
+    HDFS-4937. ReplicationMonitor can infinite-loop in
+    BlockPlacementPolicyDefault#chooseRandom() (kihwal)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES
@@ -2273,9 +2276,6 @@ Release 2.7.2 - UNRELEASED
     HDFS-9317. Document fsck -blockId and -storagepolicy options in branch-2.7.
     (aajisaka)
 
-    HDFS-4937. ReplicationMonitor can infinite-loop in
-    BlockPlacementPolicyDefault#chooseRandom() (kihwal)
-
 Release 2.7.1 - 2015-07-06
 
   INCOMPATIBLE CHANGES