Remove embedder-package scheme

tests/language/transitive_private_library_access_test.dart

+// Copyright (c) 2015, 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.
+// Dart test program to check that we can resolve unqualified identifiers
+
+// Import 'dart:typed_data' which internally imports 'dart:_internal'.
+import 'dart:typed_data';
+
+import 'package:expect/expect.dart';
+
+main() {
+  bool exceptionCaught = false;
+  try {
+    // Attempt to access something in 'dart:_internal'.
+    return ClassID.GetID(4);
+    Expect.fail("Should have thrown an exception");
+  } catch (e) {
+    exceptionCaught = true;
+  }
+  Expect.isTrue(exceptionCaught);
+}