http://productforums.google.com/forum/#!msg/chrome/Zy5IyvB0blA/zcNE_wN8e_sJ

User Style Sheet — Custom.css

~/Application Support/Google/Chrome/Default/User StyleSheets/Custom.css

@font-face { font-family: ‘helvetica’; src: local(‘Arial’); }
@font-face { font-family: ‘helvetica neue’; src: local(‘Arial’); }

@font-face { font-family: ‘helvetica’; src: local(‘helvetica neue’); }