[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
diff --git a/libs/androidfw/AssetManager.cpp b/libs/androidfw/AssetManager.cpp
index b4d482a..87164ca 100644
--- a/libs/androidfw/AssetManager.cpp
+++ b/libs/androidfw/AssetManager.cpp
@@ -1747,6 +1747,7 @@
     }
 
     mergeInfoLocked(pMergedInfo, pContents);
+    delete pContents;
     return true;
 }