Revert "IMPALA-977: Make AsyncTimeCounter exist in the averaged profile."

This reverts commit 3fad0c60e78051c238c50893bf4329aa40960281.

Change-Id: Ifebf83c9e2d8291a61947e0de6cb37aba3085b3b
Reviewed-on: http://gerrit.ent.cloudera.com:8080/2445
Reviewed-by: Nong Li <nong@cloudera.com>
Tested-by: Nong Li <nong@cloudera.com>