Merge "Fix fd leak in KeepaliveTracker." am: 4f1a3c1c74 am: af8f6f7111 am: f3ced351f0 am: 7b01e919c3

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1361907

Change-Id: Idee2fcb96d2b94120d5b53b8d402faa11c94d142