Revert "Utilize BufferedCache in TreeRepository"

This reverts commit 7f53d4c05156d4a088b7e4e621592e118ede6524.

Change-Id: I73e92439e17eac0f828f45a8e6cca16648c5ec56
(cherry picked from commit 50dbdb9fb597f342b356209a9fbc82cfa1f5b37f)