Merge "Remove unused MockableSystemProperties from DnsManager constructor" am: 3e23d7271b am: 250a9d3d20 am: 04dede7600

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1466231

Change-Id: I88c08a92dafdcb4d40374068d6f9466f5b57c819