Revert ag/13072747

The change in ag/13072747 could bring some unexpected behavior, as it
would drop important messages (onTileAdded, onTileDestroyed).

Given that there is no way to prevent messsages delivered after
onDestroy without implementing some kind of callback mechanism, instead
add explicit documentation about this behavior.

Test: build
Fixes: 172511340
Change-Id: I3fa6e41389477cbafa31809cd5041d67a76ccb91