Revert "Re-land "Search for main in the exported names of the main library, not in the library itse…

tests/language/export_double_same_main_test.dart

Index: tests/language/export_double_same_main_test.dart
diff --git a/tests/language/export_double_same_main_test.dart b/tests/language/export_double_same_main_test.dart
deleted file mode 100644
index 68ad6003113b5c22e47951df8cda586fddf59b56..0000000000000000000000000000000000000000
--- a/tests/language/export_double_same_main_test.dart
+++ /dev/null
@@ -1,6 +0,0 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-export 'top_level_entry_test.dart';
-export 'export_main_test.dart' show main;