Remove Window type selector from defaults.css in framework. Window was the name of an old class in the framework that's not around anymore, so these styles aren't needed. This type selector definition was conflicting with the one defined in airframework/defaults.css for Window. The winner depended on how you compiled the file and the ordering of the swcs (settings in airconfig.xml affected it). This fix should mean there is no conflict and the type selector definition found in airframework/defaults.css for Window will always win.
Reviewer: Evtim (also discussed with Gordon and Glenn)