Mark dartbug/27526 tests as failing in DDC.

pkg/dev_compiler/test/not_yet_strong_tests.dart

 import 'dart:collection';
 
 /// 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',
   'language/abstract_runtime_error_test_03_multi',
@@ skipping 1182 matching lines @@
   'language/mixin_invalid_bound_test_none_multi',
   'language/mixin_invalid_inheritance1_test_01_multi',
   'language/mixin_invalid_inheritance1_test_02_multi',
   'language/mixin_invalid_inheritance1_test_03_multi',
   'language/mixin_invalid_inheritance2_test_01_multi',
   'language/mixin_invalid_inheritance2_test_02_multi',
   'language/mixin_invalid_inheritance2_test_03_multi',
   'language/mixin_lib_extends_field_test',
   'language/mixin_lib_extends_method_test',
   'language/mixin_method_test',
+  'language/mixin_mixin_bound_test',
   'language/mixin_super_bound2_test_01_multi',
   'language/mixin_super_bound2_test_none_multi',
   'language/mixin_super_bound_test',
   'language/mixin_super_constructor2_test',
   'language/mixin_super_constructor_default_test',
   'language/mixin_super_constructor_named_test_01_multi',
   'language/mixin_super_constructor_named_test_none_multi',
   'language/mixin_super_constructor_positionals_test_01_multi',
   'language/mixin_super_constructor_positionals_test_none_multi',
   'language/mixin_super_constructor_test',
@@ skipping 259 matching lines @@
   'language/regress_19413_test_01_multi',
   'language/regress_19728_test',
   'language/regress_20394_test_01_multi',
   'language/regress_21793_test_01_multi',
   'language/regress_21912_test_01_multi',
   'language/regress_21912_test_02_multi',
   'language/regress_22438_test',
   'language/regress_22936_test_01_multi',
   'language/regress_23038_test_01_multi',
   'language/regress_23051_test_01_multi',
+  'language/regress_23089_test',
   'language/regress_23408_test',
   'language/return_type_test',
   'language/rewrite_implicit_this_test_01_multi',
   'language/scope_variable_test_01_multi',
   'language/setter_no_getter_call_test_01_multi',
   'language/setter_override_test_00_multi',
   'language/setter_override_test_01_multi',
   'language/setter_override_test_02_multi',
   'language/setter_override_test_03_multi',
   'language/static_field1_test',
@@ skipping 620 matching lines @@
   'lib/mirrors/fake_function_without_call_test',
   'lib/mirrors/generic_bounded_by_type_parameter_test_01_multi',
   'lib/mirrors/generic_bounded_by_type_parameter_test_02_multi',
   'lib/mirrors/generic_bounded_by_type_parameter_test_none_multi',
   'lib/mirrors/generic_bounded_test_01_multi',
   'lib/mirrors/generic_bounded_test_02_multi',
   'lib/mirrors/generic_bounded_test_none_multi',
   'lib/mirrors/generic_class_declaration_test',
   'lib/mirrors/generic_f_bounded_mixin_application_test',
   'lib/mirrors/generic_interface_test_01_multi',
+  'lib/mirrors/generics_dynamic_test',
   'lib/mirrors/generics_test_01_multi',
   'lib/mirrors/get_symbol_name_no_such_method_test',
   'lib/mirrors/immutable_collections_test',
   'lib/mirrors/inference_and_no_such_method_test',
   'lib/mirrors/inherit_field_test',
   'lib/mirrors/initializing_formals_test_01_multi',
   'lib/mirrors/initializing_formals_test_03_multi',
   'lib/mirrors/initializing_formals_test_none_multi',
   'lib/mirrors/instance_members_easier_test',
   'lib/mirrors/instance_members_test',
@@ skipping 280 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'
 ]);