Remove deprecated code

pkg/analyzer_cli/test/strong_mode_test.dart

Index: pkg/analyzer_cli/test/strong_mode_test.dart
diff --git a/pkg/analyzer_cli/test/strong_mode_test.dart b/pkg/analyzer_cli/test/strong_mode_test.dart
index 763205a8ac25ce167e901f1dbc26fe24ea9779e1..7060fa87858be609a1521eabb4c14f4917774d42 100644
--- a/pkg/analyzer_cli/test/strong_mode_test.dart
+++ b/pkg/analyzer_cli/test/strong_mode_test.dart
@@ -23,8 +23,8 @@ import 'utils.dart';
 ///
 // TODO(pq): fix tests to run safely on the bots
 // https://github.com/dart-lang/sdk/issues/25001
-main () {}
-_main() {
+main() {}
+not_main() {
   group('--strong', () {
     StringSink savedOutSink, savedErrorSink;
     int savedExitCode;