[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
Merge "[Asset Manager] Fix memory leakage bug" into du44