Make core libraries use generic method syntax.

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index e13a8dee693d798341773c11f69d16c4d91dcfb0..4c11556df0613699c7f4fc061db55d2817467f1b 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -333,6 +333,48 @@ developer/metrics_num_test: Fail # Issue 20309
 profiler/metrics_test: Fail # Issue 20309
 profiler/metrics_num_test: Fail # Issue 20309
 
+# Issue #28236
+async/first_regression_test: StaticWarning
+async/future_timeout_test: StaticWarning
+async/multiple_timer_test: StaticWarning
+async/schedule_microtask2_test: StaticWarning
+async/schedule_microtask3_test: StaticWarning
+async/schedule_microtask5_test: StaticWarning
+async/stream_controller_async_test: StaticWarning
+async/stream_first_where_test: StaticWarning
+async/stream_from_iterable_test: StaticWarning
+async/stream_iterator_test: StaticWarning
+async/stream_join_test: StaticWarning
+async/stream_last_where_test: StaticWarning
+async/stream_periodic2_test: StaticWarning
+async/stream_periodic3_test: StaticWarning
+async/stream_periodic4_test: StaticWarning
+async/stream_periodic5_test: StaticWarning
+async/stream_periodic6_test: StaticWarning
+async/stream_periodic_test: StaticWarning
+async/stream_single_test: StaticWarning
+async/stream_single_to_multi_subscriber_test: StaticWarning
+async/stream_state_nonzero_timer_test: StaticWarning
+async/stream_state_test: StaticWarning
+async/stream_subscription_as_future_test: StaticWarning
+async/stream_subscription_cancel_test: StaticWarning
+async/stream_timeout_test: StaticWarning
+async/stream_transform_test: StaticWarning
+async/stream_transformation_broadcast_test: StaticWarning
+async/timer_cancel1_test: StaticWarning
+async/timer_cancel2_test: StaticWarning
+async/timer_cancel_test: StaticWarning
+async/timer_isActive_test: StaticWarning
+async/timer_repeat_test: StaticWarning
+async/timer_test: StaticWarning
+convert/json_lib_test: StaticWarning
+js/null_test: StaticWarning
+math/point_test: StaticWarning
+math/rectangle_test: StaticWarning
+mirrors/library_uri_io_test: StaticWarning
+mirrors/library_uri_package_test: StaticWarning
+
+
 [ ($compiler == dartanalyzer || $compiler == dart2analyzer) && $checked ]
 mirrors/regress_16321_test/01: MissingCompileTimeError # Issue 16391