fix #30108, mock support for callable classes

pkg/dev_compiler/test/not_yet_strong_tests.dart

 import 'dart:collection';
 import 'package:path/path.dart' as path;
 
 /// The set of tests that are not yet strong mode safe.
 final notYetStrongTests = new HashSet<String>.from([
   'language/abstract_exact_selector_test_01_multi',
   'language/abstract_factory_constructor_test_00_multi',
   'language/abstract_getter_test_01_multi',
   'language/abstract_runtime_error_test_01_multi',
   'language/abstract_runtime_error_test_02_multi',
@@ skipping 1237 matching lines @@
   'language/naming3_test',
   'language/naming_test',
   'language/new_expression_type_args_test_00_multi',
   'language/new_expression_type_args_test_01_multi',
   'language/new_expression_type_args_test_02_multi',
   'language/new_prefix_test_01_multi',
   'language/no_such_constructor2_test',
   'language/no_such_constructor_test_01_multi',
   'language/no_such_method2_test',
   'language/no_such_method_dispatcher_test',
-  'language/no_such_method_mock_test',
   'language/no_such_method_test',
   'language/non_parameterized_factory2_test',
   'language/non_parameterized_factory_test',
   'language/not_enough_positional_arguments_test_00_multi',
   'language/not_enough_positional_arguments_test_01_multi',
   'language/not_enough_positional_arguments_test_02_multi',
   'language/not_enough_positional_arguments_test_03_multi',
   'language/not_enough_positional_arguments_test_05_multi',
   'language/not_enough_positional_arguments_test_06_multi',
   'language/not_enough_positional_arguments_test_07_multi',
@@ skipping 1143 matching lines @@
   'lib/html/mutationobserver_test',
   'lib/html/postmessage_structured_test',
   'lib/html/resource_http_test',
   'lib/html/transferables_test',
   'lib/html/webgl_1_test',
   'lib/html/wrapping_collections_test',
   // TODO(jmesserly): these are both under "dart:html" as well.
   'js_test',
   'js_util_test'
 ].map((p) => p.replaceAll('/', path.separator)));