Bug 913138 - Release nsLayoutStatics when the layout module is unloaded. r=bsmedberg
Bug 913138 - Shut down gfx at the end of layout shutdown. r=bsmedberg
Bug 913138 - Move imgLoader singleton management out of nsContentUtils. r=bsmedberg
Bug 913138 - Shut down imagelib at the end of layout shutdown. r=bsmedberg a=sylvestre