QSTileImpl is set to DESTROYED when handleDestroy

This will guarantee that there are no remaining references in the
CallbackController.

Test: atest QSTileImplTest CallbackControllerTest
Bug: 160160246

Change-Id: I308ea00b2d24febf9ad0ab1c533c4f3d2f34c675
Merged-In: I308ea00b2d24febf9ad0ab1c533c4f3d2f34c675
(cherry picked from commit c6db4059da7964dbfa7f4d4149313b318e5ddec5)
3 files changed