[Asset Manager] Fix memory leakage bug

Symptom: memory leakage
Root Cause: new SortedVector but not free it in native cpp
Solution: free the SortedVector
Project: AOSP
Note:

Change-Id: Iab5a7f2e8d8509631301e7231427927d4797c856
HeadsUp: Filter out notifications from system uid packages.

    - Settings is very spammy in its notifications, so lets
    just ignore them.

Change-Id: Ic269e8727efb2021d76cccecb9f7e555034d1925