Disable 'variable scope variables in function' in 'variable_scope_tes…

…t.dart'

See #2469

dwds/test/variable_scope_test.dart

@@ -206,7 +206,7 @@ void main() {
           'testClass',
         ]),
       );
-    });
+    }, skip: 'See https://github.com/dart-lang/webdev/issues/2469');
 
     test('variables in closure nested in method', () async {
       stack = await breakAt('nestedClosure', mainScript);