Fix misnamed kwarg to HttpResponse.
Fix misnamed kwarg to HttpResponse.

mathjazz/pontoon,vivekanand1101/pontoon,m8ttyB/pontoon,yfdyh000/pontoon,sudheesh001/pontoon,jotes/pontoon,mozilla/pontoon,sudheesh001/pontoon,yfdyh000/pontoon,Osmose/pontoon,sudheesh001/pontoon,mathjazz/pontoon,yfdyh000/pontoon,Osmose/pontoon,mastizada/pontoon,m8ttyB/pontoon,participedia/pontoon,m8ttyB/pontoon,participedia/pontoon,yfdyh000/pontoon,vivekanand1101/pontoon,mathjazz/pontoon,vivekanand1101/pontoon,Jobava/mirror-pontoon,Jobava/mirror-pontoon,mozilla/pontoon,mozilla/pontoon,Jobava/mirror-pontoon,Osmose/pontoon,m8ttyB/pontoon,vivekanand1101/pontoon,mastizada/pontoon,mastizada/pontoon,Osmose/pontoon,participedia/pontoon,mozilla/pontoon,Jobava/mirror-pontoon,participedia/pontoon,mozilla/pontoon,mathjazz/pontoon,jotes/pontoon,sudheesh001/pontoon,jotes/pontoon,mastizada/pontoon,mathjazz/pontoon,jotes/pontoon