Suppress NO_DEFAULT_BOUND errors.

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 913 matching lines @@
   'language/is_function_test',
   'language/is_malformed_type_test_94_multi',
   'language/is_malformed_type_test_95_multi',
   'language/is_malformed_type_test_96_multi',
   'language/is_malformed_type_test_97_multi',
   'language/is_malformed_type_test_98_multi',
   'language/is_malformed_type_test_99_multi',
   'language/is_not_class2_test',
   'language/is_object_test',
   'language/isnot_malformed_type_test',
-  'language/issue_23914_test', // issue 28478
   'language/issue11724_test',
   'language/issue11793_test',
   'language/issue13474_test',
   'language/issue1363_test',
   'language/issue15606_test_01_multi',
   'language/issue18628_1_test_01_multi',
   'language/issue18628_2_test_01_multi',
   'language/issue21159_test',
   'language/issue3806_test',
   'language/keyword_type_expression_test_01_multi',
@@ skipping 496 matching lines @@
   'language/proxy2_test_01_multi',
   'language/proxy2_test_02_multi',
   'language/proxy3_test_01_multi',
   'language/proxy3_test_02_multi',
   'language/proxy3_test_03_multi',
   'language/proxy3_test_04_multi',
   'language/proxy_test_01_multi',
   'language/proxy_test_02_multi',
   'language/proxy_test_05_multi',
   'language/proxy_test_06_multi',
-  'language/recursive_generic_test', // issue 28478
-  'language/recursive_inheritance_test', // issue 28478
   'language/redirecting_constructor_initializer_test',
   'language/redirecting_factory_default_values_test_01_multi',
   'language/redirecting_factory_default_values_test_02_multi',
   'language/redirecting_factory_default_values_test_none_multi',
   'language/redirecting_factory_incompatible_signature_test',
   'language/redirecting_factory_infinite_steps_test_01_multi',
   'language/redirecting_factory_infinite_steps_test_02_multi',
   'language/redirecting_factory_long_test',
   'language/redirecting_factory_malbounded_test_01_multi',
   'language/redirecting_factory_malbounded_test_none_multi',
@@ skipping 623 matching lines @@
   'corelib/symbol_reserved_word_test_07_multi',
   'corelib/symbol_reserved_word_test_08_multi',
   'corelib/symbol_reserved_word_test_10_multi',
   'corelib/symbol_reserved_word_test_11_multi',
   'corelib/symbol_test_01_multi',
   'corelib/symbol_test_02_multi',
   'corelib/symbol_test_03_multi',
   'corelib/symbol_test_none_multi',
   'corelib/uri_path_test',
   'corelib/uri_query_test',
-  'lib/collection/linked_list_test', // issue 28478
   'lib/convert/chunked_conversion1_test',
   'lib/math/min_max_test',
   'lib/typed_data/float32x4_test',
   'lib/typed_data/float64x2_functional_test',
   'lib/typed_data/int32x4_test',
   'lib/mirrors/abstract_class_test_00_multi',
   'lib/mirrors/abstract_test',
   'lib/mirrors/circular_factory_redirection_test_01_multi',
   'lib/mirrors/circular_factory_redirection_test_02_multi',
   'lib/mirrors/class_declarations_test_01_multi',
@@ skipping 311 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'
 ]);