Revert "YARN-2603. ApplicationConstants missing HADOOP_MAPRED_HOME (Ray Chiang via aw)"

This reverts commit b0a9cd37ab9ef45ed9a71b04f1634fa54dd4c438.

Conflicts:
	hadoop-yarn-project/CHANGES.txt

hadoop-yarn-project/CHANGES.txt

@@ -81,9 +81,6 @@ Release 2.7.0 - UNRELEASED
     YARN-2713. "RM Home" link in NM should point to one of the RMs in an 
     HA setup. (kasha)
 
-    YARN-2603. ApplicationConstants missing HADOOP_MAPRED_HOME (Ray Chiang via
-    aw)
-
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/ApplicationConstants.java

@@ -180,11 +180,6 @@ public interface ApplicationConstants {
      */
     HADOOP_HDFS_HOME("HADOOP_HDFS_HOME"),
     
-    /**
-     * $HADOOP_MAPRED_HOME
-     */
-    HADOOP_MAPRED_HOME("HADOOP_MAPRED_HOME"),
-    
     /**
      * $MALLOC_ARENA_MAX
      */