[Sass] Fix a test incompatibility with Ruby 1.9.
[Sass] Fix a test incompatibility with Ruby 1.9.

DanteKaris/sass,srinivashappy/sass,dylannnn/sass,stanhu/haml,schneems/sass,zaru/sass,dg1dd1ngs/haml,stewx/sass,schneems/sass,purcell/haml,askl56/sass,saper/sass,nazar-pc/haml,amitsuroliya/sass,MetaAshley/sass,MetaAshley/sass,haml/haml,nickg33/sass,14113/sass,StephanieMak/sass,tangposmarvin/sass,xzyfer/sass,zaru/sass,StephanieMak/sass,Ahnita/sass,HugoRLopes/sass,Ahnita/sass,Nzaga/sass,modulexcite/sass,danielfein/sass,amatsuda/haml,Nzaga/sass,JuanitoFatas/sass,Iamronan/sass,Iamronan/sass,saper/sass,jaroot32/sass,DanteKaris/sass,dg1dd1ngs/haml,liquidmetal/sass,uniba/hamldoc_ja,lmetla/sass,antonifs/sass,concord-consortium/haml,srawlins/sass,tangposmarvin/haml,keithpitty/haml,cmpereirasi/sass,ridixcr/sass,baiyanghese/sass,rammy7219/sass,modulexcite/sass,nicklima/sass,PMArtz92/sass,Industrys/sass,keithpitty/haml,PMArtz92/sass,ridixcr/sass,tangposmarvin/haml,dylannnn/sass,hcatlin/sass,HugoRLopes/sass,danielfein/sass,liquidmetal/sass,nicklima/sass,stanhu/haml,Anshdesire/sass,haml/haml,tenderlove/sass,macressler/haml,nazar-pc/haml,haml/haml,srinivashappy/sass,hcatlin/sass,jaroot32/sass,macressler/haml,lmetla/sass,nickg33/sass,askl56/sass,xzyfer/sass,haml/haml,chriseppstein/haml,sideci-sample/sideci-sample-haml,Industrys/sass,OrenBochman/sass,antonifs/sass,Andrey-Pavlov/sass,oss-practice/sass,stewx/sass,Galactix/sass,Andrey-Pavlov/sass,JuanitoFatas/sass,cmpereirasi/sass,srawlins/sass,Anshdesire/sass,rammy7219/sass,chriseppstein/sass,OrenBochman/sass,tangposmarvin/sass,amitsuroliya/sass,Galactix/sass,chriseppstein/haml,briangonzalez/sass