Use generic functions in zones.

pkg/dev_compiler/test/not_yet_strong_tests.dart

 import 'dart:collection';
 import 'package:path/path.dart' as path;
 
 /// 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',
@@ skipping 2055 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/async/async_await_sync_completer_test',
-  'lib/async/async_await_zones_test',
   'lib/async/catch_errors2_test',
   'lib/async/catch_errors3_test',
   'lib/async/catch_errors_test',
   'lib/async/future_microtask_test',
   'lib/async/future_or_bad_type_test_00_multi',
   'lib/async/future_or_bad_type_test_01_multi',
   'lib/async/future_or_only_in_async_test_00_multi',
   'lib/async/future_test_none_multi',
   'lib/async/future_test_01_multi',
   'lib/async/future_value_chain4_test',
@@ skipping 325 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'
 ].map((p) => p.replaceAll('/', path.separator)));