remove unused variables from travis environment
remove unused variables from travis environment

antidotcb/googletest,google/googletest,jlanecox/googletest,google/googletest,google/googletest,empiredan/googletest,antidotcb/googletest,jlanecox/googletest,antidotcb/googletest,xnagireddy/googletest,xnagireddy/googletest,fuchsia-mirror/third_party-googletest,fuchsia-mirror/third_party-googletest,jlanecox/googletest,google/googletest,gianricardo/googletest,fuchsia-mirror/third_party-googletest,antidotcb/googletest,xnagireddy/googletest,jlanecox/googletest,fuchsia-mirror/third_party-googletest,gianricardo/googletest,empiredan/googletest,xnagireddy/googletest,gianricardo/googletest,empiredan/googletest