Reorganize the dart2js transformer tests.

sdk/lib/_internal/pub/test/build/dart2js_finds_imports_across_packages_test.dart

Index: sdk/lib/_internal/pub/test/build/dart2js_finds_imports_across_packages_test.dart
diff --git a/sdk/lib/_internal/pub/test/build/dart2js_finds_imports_across_packages_test.dart b/sdk/lib/_internal/pub/test/build/dart2js_finds_imports_across_packages_test.dart
deleted file mode 100644
index 3218499bbde70b33f86dd5aca01d0f345b521745..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/test/build/dart2js_finds_imports_across_packages_test.dart
+++ /dev/null
@@ -1,61 +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.
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-main() {
-  initConfig();
-
-  // This is a regression test for https://dartbug.com/15183. The code that
-  // stripped .dart files from release builds was in the forwarding transformer,
-  // and that transformer was applied to all loaded packages. That meant that
-  // if the root package imported a .dart file from another package, the
-  // forwarding transformer in that package would remove the file before
-  // dart2js could find it when compiling the entrypoint in the root package.
-
-  integration("dart2js can find imports across packages", () {
-    // Dart2js can take a long time to compile dart code, so we increase the
-    // timeout to cope with that.
-    currentSchedule.timeout *= 3;
-
-    d.dir("foo", [
-      d.libPubspec("foo", "0.0.1"),
-      d.dir("lib", [
-        d.file("foo.dart",
-            """
-            library foo;
-            foo() => 'foo';
-            """)
-      ])
-    ]).create();
-
-    d.dir(appPath, [
-      d.appPubspec({
-        "foo": {"path": "../foo"}
-      }),
-      d.dir("web", [
-        d.file("main.dart",
-            """
-            import 'package:foo/foo.dart';
-            main() => print(foo());
-            """)
-      ])
-    ]).create();
-
-    schedulePub(args: ["build"],
-        output: new RegExp(r'Built 2 files to "build".'));
-
-    d.dir(appPath, [
-      d.dir('build', [
-        d.dir('web', [
-          d.matcherFile('main.dart.js', isNot(isEmpty)),
-          d.matcherFile('main.dart.precompiled.js', isNot(isEmpty))
-        ])
-      ])
-    ]).validate();
-  });
-}