Reorganize the dart2js transformer tests.

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

Index: sdk/lib/_internal/pub/test/transformer/dart2js/output_can_be_consumed_by_successive_phases.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/dart2js/output_can_be_consumed_by_successive_phases.dart b/sdk/lib/_internal/pub/test/transformer/dart2js/output_can_be_consumed_by_successive_phases.dart
deleted file mode 100644
index f44eb9058167d41c9afdb90a6e7abdb8a6953e45..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/transformer/dart2js/output_can_be_consumed_by_successive_phases.dart
+++ /dev/null
@@ -1,52 +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';
-
-/// The code for a transformer that renames ".js" files to ".out".
-const JS_REWRITE_TRANSFORMER = """
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-
-class RewriteTransformer extends Transformer {
-  RewriteTransformer.asPlugin();
-
-  String get allowedExtensions => '.js';
-
-  Future apply(Transform transform) {
-    return transform.primaryInput.readAsString().then((contents) {
-      var id = transform.primaryInput.id.changeExtension(".out");
-      transform.addOutput(new Asset.fromString(id, contents));
-    });
-  }
-}
-""";
-
-main() {
-  initConfig();
-
-  integration("output can be consumed by successive phases", () {
-    d.dir(appPath, [
-      d.pubspec({
-        "name": "myapp",
-        "transformers": ["\$dart2js", "myapp/src/transformer"]
-      }),
-      d.dir("lib", [d.dir("src", [
-        d.file("transformer.dart", JS_REWRITE_TRANSFORMER)
-      ])]),
-      d.dir("web", [d.file("main.dart", "void main() {}")])
-    ]).create();
-
-    createLockFile('myapp', pkg: ['barback']);
-
-    pubServe();
-    requestShouldSucceed("main.dart.out", isUnminifiedDart2JSOutput);
-    endPubServe();
-  });
-}