Removed unused private field (Clang warning).
Removed unused private field (Clang warning).

ksubramz/CppMicroServices,ksubramz/CppMicroServices,saschazelzer/CppMicroServices,ksubramz/CppMicroServices,CppMicroServices/CppMicroServices,CppMicroServices/CppMicroServices,CppMicroServices/CppMicroServices,ksubramz/CppMicroServices,ksubramz/CppMicroServices,mobileFX/CppMicroServices,CppMicroServices/CppMicroServices,mobileFX/CppMicroServices,Heather/CppMicroServices,Heather/CppMicroServices,quinnlin/CppMicroServices,saschazelzer/CppMicroServices,quinnlin/CppMicroServices,CppMicroServices/CppMicroServices