Remove duplicate chrome requirement in TravisCI
Remove duplicate chrome requirement in TravisCI

DigitalCurationCentre/roadmap,DigitalCurationCentre/roadmap,DigitalCurationCentre/roadmap,CDLUC3/roadmap,CDLUC3/dmptool,CDLUC3/dmptool,DMPRoadmap/roadmap,DMPRoadmap/roadmap,CDLUC3/roadmap,CDLUC3/roadmap,CDLUC3/dmptool,DMPRoadmap/roadmap,CDLUC3/dmptool,CDLUC3/roadmap