examples/ct: use http.Constants
examples/ct: use http.Constants

gdbelvin/trillian,gtank/trillian,google/trillian,daviddrysdale/trillian,Martin2112/trillian,RJPercival/trillian,codingllama/trillian,gdbelvin/trillian,daviddrysdale/trillian,Martin2112/trillian,gdbelvin/trillian,AlCutter/trillian,AlCutter/trillian,codingllama/trillian,RJPercival/trillian,gtank/trillian,google/trillian,daviddrysdale/trillian,Martin2112/trillian