Update test expectations to reflect errors that are now warning.

pkg/dev_compiler/test/not_yet_strong_tests.dart

Index: pkg/dev_compiler/test/not_yet_strong_tests.dart
diff --git a/pkg/dev_compiler/test/not_yet_strong_tests.dart b/pkg/dev_compiler/test/not_yet_strong_tests.dart
index 0ac9e13679c24613ab5b71ee2bcb8a5778d4a8c1..ca2b1cb5e98f4c12ee74341451200c335b29ee49 100644
--- a/pkg/dev_compiler/test/not_yet_strong_tests.dart
+++ b/pkg/dev_compiler/test/not_yet_strong_tests.dart
@@ -2,7 +2,6 @@ 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',
@@ -105,15 +104,6 @@ final notYetStrongTests = new HashSet<String>.from([
   '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',
@@ -254,7 +244,6 @@ final notYetStrongTests = new HashSet<String>.from([
   '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',
@@ -845,7 +834,6 @@ final notYetStrongTests = new HashSet<String>.from([
   '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',
@@ -950,7 +938,6 @@ final notYetStrongTests = new HashSet<String>.from([
   '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',
@@ -2034,7 +2021,6 @@ final notYetStrongTests = new HashSet<String>.from([
   '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',
@@ -2105,7 +2091,6 @@ final notYetStrongTests = new HashSet<String>.from([
   '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',