Valgrind cleanliness, part 4: Delete CounterMap on exit.
Valgrind cleanliness, part 4: Delete CounterMap on exit.

This fixes 2 leaks, returning 112 bytes of lost memory.

As an additional bonus, a useless check has been removed (no need to check for
NULL before a delete).

Review URL: https://chromiumcodereview.appspot.com/9864029

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@11152 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh