Don't implicitly run "pub get".

test/serve/gets_first_if_source_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 17 matching lines @@
         'packages': {
           'foo': {
             'version': '0.0.0',
             'source': 'hosted',
             'description': 'foo'
           }
         }
       }))
     ]).create();
 
-    pubServe(shouldGetFirst: true);
+    pubGet();
+    pubServe();
     requestShouldSucceed("packages/foo/foo.dart", 'main() => "foo";');
     endPubServe();
   });
 }