Remove callbacks and messages in onDestroy().

The Runnable is running after destroying the Cursor, which only happens in onDestroy(). So clean up before that happens.

Bug: 151283186
Test: Built, installed, and set ringtone.
Change-Id: I95c824675e6e710a1dc5d1f8faef2daff6f563e6
Merged-In: I95c824675e6e710a1dc5d1f8faef2daff6f563e6
(cherry picked from commit 2e23b5c0139e78240c2eede61b19731acd7f8c71)
1 file changed