Revert "Use ArraySet for the list of observer WeakReference."
This reverts commit 3488f1af. Reason for revert: The change to ArraySet increase system_server startup time by 20ms as reported in b/111658334. It is because add() operation into ArraySet takes much longer than ArrayList. Change-Id: I1523332a8c9fc74cfef29b119a3c4c54d55596ec
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