Reorganize the dart2js transformer tests.

sdk/lib/_internal/pub/test/transformer/dart2js/minify_configuration_overrides_mode_test.dart

Index: sdk/lib/_internal/pub/test/transformer/dart2js/minify_configuration_overrides_mode_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/dart2js/minify_configuration_overrides_mode_test.dart b/sdk/lib/_internal/pub/test/transformer/dart2js/minify_configuration_overrides_mode_test.dart
deleted file mode 100644
index 646d624925a1f731fd0eb200a13df883e5a92e56..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/transformer/dart2js/minify_configuration_overrides_mode_test.dart
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 pub_tests;
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-import '../../serve/utils.dart';
-
-main() {
-  initConfig();
-
-  integration("minify configuration overrides the mode", () {
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": [{
-          "\$dart2js": {"minify": true}
-        }]
-      }),
-      d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", REWRITE_TRANSFORMER)
-      ])])
-    ]).create();
-
-    createLockFile('myapp', pkg: ['barback']);
-
-    pubServe();
-    requestShouldSucceed("main.dart.js", isMinifiedDart2JSOutput);
-    endPubServe();
-  });
-}