More fixes for failures on the Windows bot

pkg/analyzer/test/file_system/test_all.dart

Index: pkg/analyzer/test/file_system/test_all.dart
diff --git a/pkg/analyzer/test/file_system/test_all.dart b/pkg/analyzer/test/file_system/test_all.dart
index 3bacc6cff83058e26d713c415a2429e9131cd97e..303df094d69348fa968193c2d42fb1d7056e3c2f 100644
--- a/pkg/analyzer/test/file_system/test_all.dart
+++ b/pkg/analyzer/test/file_system/test_all.dart
@@ -6,6 +6,7 @@ library test.file_system;
 
 import 'package:unittest/unittest.dart';
 
+import '../utils.dart';
 import 'memory_file_system_test.dart' as memory_file_system_test;
 import 'physical_resource_provider_test.dart'
     as physical_resource_provider_test;
@@ -13,7 +14,7 @@ import 'resource_uri_resolver_test.dart' as resource_uri_resolver_test;
 
 /// Utility for manually running all tests.
 main() {
-  groupSep = ' | ';
+  initializeTestEnvironment();
   group('file_system', () {
     memory_file_system_test.main();
     physical_resource_provider_test.main();