Merge "Implement Drop for WpIBinder, to avoid memory leak." am: 1030825016 am: e064abcb16 am: 67aea20954

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1531633

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I43c3654e912c69915776e9f69e6cf5d4b602636d