Merge "libbinder: remove unused 'pool' var" am: 226376f9 am: 24eb9449 am:...

Merge "libbinder: remove unused 'pool' var" am: 226376f9 am: 24eb9449 am: 1f08aa3f am: 593d4330

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1702011

Change-Id: I7355c096b9dccb096745c6ed29c456b0289c3a8c