Bug 1707996 - change checkboxes in download dialog to native, r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D113638

Author: martinbalfanz

toolkit/mozapps/downloads/content/unknownContentType.xhtml

@@ -98,7 +98,8 @@
       <hbox class="small-indent">
         <checkbox id="rememberChoice" label="&rememberChoice.label;"
                   accesskey="&rememberChoice.accesskey;"
-                  oncommand="dialog.toggleRememberChoice(event.target);"/>
+                  oncommand="dialog.toggleRememberChoice(event.target);"
+                  native="true"/>
       </hbox>
 
       <separator/>