cbf1e41fec
MagnetizedObject used to register setting observer for each instance, but it's never unregistered. MagnetizedObject doesn't have explicit lifecycle calls, so there isn't a good place to unregister the observer. Without unregistration MagnetizedObject will always be referenced by a JNI global reference so that it can be called when the remote calls it. It's not necessary to have an observer per instance, so let's do it in the companion object instead then we don't need to worry about unregistering it because it's long standing. Bug: 149918957 Test: MagnetizedObject isn't referenced by any JNI global references. Test: Device still vibrates when bubble stack is attracted by the removal place when settings is on, and doesn't vibrate when settings is off. Change-Id: Ie9719baa3ff76bd08180b9ab32662eb1ca43de3a