This change removes the properties in GlobalJSONConfig that are used to
hold the unmarshalled []string along with the code to convert them into
ConfiguredJarList as they are no longer necessary because the
ConfiguredJarList.UnmarshalJSON(..) method can handle that automatically.
Bug: 171479578
Test: m nothing
Change-Id: Ie297cd00cb23d12e544d922454868db6fe9eb77c