Don't implicitly run "pub get".

test/serve/gets_first_if_dev_dependency_changed_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.
 
 library pub_tests;
 
 import 'dart:convert';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
@@ skipping 12 matching lines @@
         "name": "myapp",
         "dev_dependencies": {
           "foo": {"path": "../foo"}
         }
       }),
       d.file("pubspec.lock", JSON.encode({
         'packages': {}
       }))
     ]).create();
 
-    pubServe(shouldGetFirst: true);
+    pubGet();
+    pubServe();
     requestShouldSucceed("packages/foo/foo.dart", 'main() => "foo";');
     endPubServe();
   });
 }