Don't implicitly run "pub get".

test/dart2js/allows_import_in_dart_code_test.dart

 // 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.
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
@@ skipping 24 matching lines @@
 import 'package:foo/foo.dart';
 import 'package:myapp/lib.dart';
 void main() {
   print(foo());
   print(lib());
 }
 """)
       ])
     ]).create();
 
-    pubServe(shouldGetFirst: true);
+    pubGet();
+    pubServe();
     requestShouldSucceed("main.dart.js", contains("footext"));
     requestShouldSucceed("main.dart.js", contains("libtext"));
     endPubServe();
   });
 }