Simplify tests under utils/tests to follow StandardTestSuite convention.

utils/tests/import_mapper/test_config.dart

Index: utils/tests/import_mapper/test_config.dart
diff --git a/utils/tests/import_mapper/test_config.dart b/utils/tests/import_mapper/test_config.dart
deleted file mode 100644
index ccb576315b4ba38f04e8d3e60c5e01d68e2b0938..0000000000000000000000000000000000000000
--- a/utils/tests/import_mapper/test_config.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2012, 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.
-
-#library("import_mapper_test_config");
-
-#import("../../../tools/testing/dart/test_suite.dart");
-
-class ImportMapperTestSuite extends StandardTestSuite {
-  ImportMapperTestSuite(Map configuration)
-      : super(configuration,
-              "import_mapper",
-              "utils/tests/import_mapper/src",
-              ["utils/tests/import_mapper/import_mapper.status"]);
-
-  bool isTestFile(String filename) => filename.endsWith("_tests.dart");
-}