YARN-441. Removed unused utility methods for collections from two API records. Contributed by Xuan Gong.
MAPREDUCE-5163. Update MR App to not use API utility methods for collections after YARN-441. Contributed by Xuan Gong.


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1469657 13f79535-47bb-0310-9956-ffa450edef68