Android: nuke HeapStatsLogger.

1) It was only used on long-gone test harness, replaced by better tools such as
Telemetry, memory acceptance, etc.
2) It's been deprecated since API level 18 (JB MR2)

BUG=

Review URL: https://codereview.chromium.org/179123003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255048 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 255048