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

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I38771890d9bd9ba93cba86bb4cb29bf5fda5546d