Remove code referencing Google protocol buffers version 1.
Remove code referencing Google protocol buffers version 1.

dpull/googletest,goby/googletest,goby/googletest,dpull/googletest,gclone/googletest,osamu0329nakamura/googletest,old8xp/googletest-from-google,dpull/googletest,BeeswaxIO/googletest,Perfexion/googletest,goby/googletest,old8xp/googletest-from-google,BeeswaxIO/googletest,gclone/googletest,Perfexion/googletest,Perfexion/googletest,BeeswaxIO/googletest,osamu0329nakamura/googletest,gclone/googletest,old8xp/googletest-from-google,osamu0329nakamura/googletest