Migrate first block of tests in standalone to standalone_2

tests/standalone_2/deferred_transitive_import_error_test.dart

 // Copyright (c) 2016, 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:expect/expect.dart";
 // A deferred library that doesn't exist.
 import 'package:foo/foo.dart' deferred as foo;
 // A deferred library that does exist.
 import 'deferred/exists.dart' deferred as exists;
 // A deferred library that transitively will fail due to a file not found.
 import 'deferred/transitive_error.dart' deferred as te;
 
 main() async {
   // Attempt to load foo which will fail.
   var fooError;
   await foo.loadLibrary().catchError((e) {
     fooError = e;
   });
   Expect.isNotNull(fooError);
   await exists.loadLibrary();
   Expect.equals(99, exists.x);
   /* TODO(johnmccutchan): Implement transitive error reporting.
   var teError;
   await te.loadLibrary().catchError((e) {
     teError = e;
   });
   Expect.isNotNull(teError);
   */
 }