Revert "Set setCurrentProxyScriptUrl as public"
Revert submission 1532910-connectivity_jar_in_apex
Reason for revert: Breaks boot tests: b/176969905
Reverted Changes:
Ie41a5b569:Set setCurrentProxyScriptUrl as public
Id7b6a4664:Move service-connectivity to the tethering APEX
Ia7cb83834:Add service-connectivity to tethering APEX
Change-Id: I9f31d4810a92e620f02cc8d24bdf18fe28001a2b