[Haml] Fix some Ruby 1.9 test failures.
[Haml] Fix some Ruby 1.9 test failures.

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