Deprecate Activity.onStateNotSaved

This callback is no longer accurate, because it is basically
onPreResume(), but onSaveInstance isn't related to Pause/Resume
at all. In addition, this callback was added for framework fragments
and they are deprecated

bug: 113134425
Test: no logic changes
Change-Id: I8f961846b52032d9760d5050a2d8ee5ec57c49cd