Merge changes from topic "pacproxy-service"

* changes:
  Make PacProxyService be a system service
  Revert^2 "Refactor setCurrentProxyScriptUrl to a void method"
tree: 01bbeb0569a7a6b756e62f2b3d8215549be624a3
  1. core/
  2. framework/
  3. service/
  4. services/
  5. tests/
  6. OWNERS