mark the hidden window's widget as invisible (on all platforms, now). bug 207742 r=brendan,bryner

xpfe/appshell/src/nsAppShellService.cpp

@@ -726,11 +726,9 @@ nsAppShellService::JustCreateTopWindow(nsIXULWindow *aParent,
   else {
     nsWidgetInitData widgetInitData;
 
-#if TARGET_CARBON
     if (aIsHiddenWindow)
       widgetInitData.mWindowType = eWindowType_invisible;
     else
-#endif
       widgetInitData.mWindowType = aChromeMask & nsIWebBrowserChrome::CHROME_OPENAS_DIALOG ?
                                     eWindowType_dialog : eWindowType_toplevel;