Fixed broken unit test on Gecko.
Fixed broken unit test on Gecko.

fillabs/TinySpecMCE,sjbufton/tinymce,nbcp/tinymce,MediehusetTek/tinymce,blakewallan/tinymce,TeamupCom/tinymce,rbecheras/tinymce,tinymce/tinymce,tinymce/tinymce,1099511627776/tinymce,rbecheras/tinymce,adaptiffdesigns/tinymce,jashua212/tinymce,leofeyer/tinymce,sjbufton/tinymce,danielpunkass/tinymce,blakewallan/tinymce,ikuchmin/tinymce,jtark/tinymce,henrythewasp/tinymce,FernCreek/tinymce,rednose-public/tinymce,FernCreek/tinymce,ikuchmin/tinymce,FernCreek/tinymce,adaptiffdesigns/tinymce,aduth/tinymce,ETSI-CTI/TinySpecMCE,fillabs/TinySpecMCE,rednose-public/tinymce,tinymce/tinymce,leofeyer/tinymce,jashua212/tinymce,danielpunkass/tinymce,ETSI-CTI/TinySpecMCE,henrythewasp/tinymce,1099511627776/tinymce,TeamupCom/tinymce,jtark/tinymce,aduth/tinymce,danielpunkass/tinymce,gencer/tinymce,nbcp/tinymce,MediehusetTek/tinymce,gencer/tinymce