Low risk fix for bug 199915. Can't use File Bookmark in XP.

r=bryner, sr=jag, a=sspitzer

widget/src/windows/nsNativeThemeWin.cpp

@@ -916,7 +916,8 @@ nsNativeThemeWin::GetMinimumWidgetSize(nsIRenderingContext* aContext, nsIFrame*
   if (aWidgetType == NS_THEME_TOOLBOX || aWidgetType == NS_THEME_TOOLBAR || 
       aWidgetType == NS_THEME_STATUSBAR || aWidgetType == NS_THEME_PROGRESSBAR_CHUNK ||
       aWidgetType == NS_THEME_PROGRESSBAR_CHUNK_VERTICAL ||
-      aWidgetType == NS_THEME_TAB_PANELS || aWidgetType == NS_THEME_TAB_PANEL)
+      aWidgetType == NS_THEME_TAB_PANELS || aWidgetType == NS_THEME_TAB_PANEL ||
+      aWidgetType == NS_THEME_LISTBOX || aWidgetType == NS_THEME_TREEVIEW)
     return NS_OK; // Don't worry about it.
 
   if (!getThemePartSize)