Update test expectations to reflect errors that are now warning.

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([
-  'closure',
   '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',
   'language/abstract_syntax_test_00_multi',
   'language/abstract_syntax_test_01_multi',
   'language/argument_definition_test_01_multi',
   'language/arithmetic_test',
@@ skipping 82 matching lines @@
   'language/async_await_syntax_test_d10a_multi',
   'language/async_await_syntax_test_e1_multi',
   'language/async_await_syntax_test_e2_multi',
   'language/async_await_syntax_test_e3_multi',
   'language/async_await_syntax_test_e4_multi',
   'language/async_await_syntax_test_e5_multi',
   'language/async_await_syntax_test_e6_multi',
   'language/async_await_syntax_test_e7_multi',
   'language/async_await_syntax_test_e8_multi',
   'language/async_await_syntax_test_e9_multi',
-  'language/async_await_test_none_multi',
-  'language/async_await_test_02_multi',
-  'language/async_await_test_03_multi',
-  'language/async_star_test_none_multi',
-  'language/async_star_test_01_multi',
-  'language/async_star_test_02_multi',
-  'language/async_star_test_03_multi',
-  'language/async_star_test_04_multi',
-  'language/async_star_test_05_multi',
   'language/async_or_generator_return_type_stacktrace_test_01_multi',
   'language/async_or_generator_return_type_stacktrace_test_02_multi',
   'language/async_or_generator_return_type_stacktrace_test_03_multi',
   'language/async_return_types_test_tooManyTypeParameters_multi',
   'language/async_return_types_test_wrongReturnType_multi',
   'language/async_return_types_test_wrongTypeParameter_multi',
   'language/await_backwards_compatibility_test_await1_multi',
   'language/await_backwards_compatibility_test_await2_multi',
   'language/await_backwards_compatibility_test_await3_multi',
   'language/await_backwards_compatibility_test_await4_multi',
@@ skipping 120 matching lines @@
   'language/class_literal_test_19_multi',
   'language/class_literal_test_20_multi',
   'language/class_literal_test_21_multi',
   'language/class_literal_test_22_multi',
   'language/class_literal_test_23_multi',
   'language/class_literal_test_24_multi',
   'language/class_literal_test_25_multi',
   'language/class_override_test_00_multi',
   'language/class_syntax_test_01_multi',
   'language/closure_in_initializer_test',
-  'language/closure_side_effect_test',
   'language/closure_internals_test',
   'language/closure_type_test_01_multi',
   'language/closure_type_test_none_multi',
   'language/compile_time_constant10_test_01_multi',
   'language/compile_time_constant10_test_02_multi',
   'language/compile_time_constant13_test_02_multi',
   'language/compile_time_constant13_test_03_multi',
   'language/compile_time_constant13_test_04_multi',
   'language/compile_time_constant13_test_05_multi',
   'language/compile_time_constant_arguments_test_01_multi',
@@ skipping 570 matching lines @@
   'language/getter_parameters_test_04_multi',
   'language/getter_setter_in_lib_test',
   'language/getters_setters2_test_02_multi',
   'language/getters_setters2_test_03_multi',
   'language/hidden_import_test_01_multi',
   'language/hidden_import_test_02_multi',
   'language/identical_const_test_01_multi',
   'language/identical_const_test_02_multi',
   'language/identical_const_test_03_multi',
   'language/identical_const_test_04_multi',
-  'language/inferrer_constructor3_test',
   'language/if_null_assignment_behavior_test_03_multi',
   'language/if_null_assignment_behavior_test_04_multi',
   'language/if_null_assignment_behavior_test_13_multi',
   'language/if_null_assignment_behavior_test_14_multi',
   'language/if_null_assignment_behavior_test_15_multi',
   'language/if_null_assignment_behavior_test_29_multi',
   'language/if_null_assignment_behavior_test_30_multi',
   'language/if_null_assignment_static_test_02_multi',
   'language/if_null_assignment_static_test_04_multi',
   'language/if_null_assignment_static_test_05_multi',
@@ skipping 84 matching lines @@
   '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/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',
   'language/keyword_type_expression_test_02_multi',
   'language/keyword_type_expression_test_03_multi',
@@ skipping 1063 matching lines @@
   'corelib/big_integer_arith_vm_test_trunDiv_multi',
   'corelib/bool_from_environment2_test_01_multi',
   'corelib/bool_from_environment2_test_02_multi',
   'corelib/bool_from_environment2_test_03_multi',
   'corelib/bool_from_environment2_test_04_multi',
   'corelib/bool_from_environment2_test_05_multi',
   'corelib/core_runtime_types_test',
   'corelib/data_resource_test',
   'corelib/duration2_test',
   'corelib/error_stack_trace_test',
-  'corelib/error_stack_trace2_test',
   'corelib/from_environment_const_type_test_02_multi',
   'corelib/from_environment_const_type_test_03_multi',
   'corelib/from_environment_const_type_test_04_multi',
   'corelib/from_environment_const_type_test_06_multi',
   'corelib/from_environment_const_type_test_07_multi',
   'corelib/from_environment_const_type_test_08_multi',
   'corelib/from_environment_const_type_test_09_multi',
   'corelib/from_environment_const_type_test_11_multi',
   'corelib/from_environment_const_type_test_12_multi',
   'corelib/from_environment_const_type_test_13_multi',
@@ skipping 50 matching lines @@
   '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/convert/chunked_conversion1_test',
-  'lib/html/input_element_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',
   'lib/mirrors/class_declarations_test_none_multi',
@@ skipping 308 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'
 ]);