Update ProxyInfo(String) to ProxyInfo(Uri) am: 6e1d96a631 am: b8fcb2f508 am: 7b04bd9e1a

Original change: https://android-review.googlesource.com/c/platform/packages/apps/ManagedProvisioning/+/1146585

Change-Id: I8aacb93554711f46980ed6802ad2e77f7b7f283c