Fix a bunch of pub tests that started running "pub get".

test/dart2js/output_can_be_consumed_by_successive_phases.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 '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
 /// The code for a transformer that renames ".js" files to ".out".
 const JS_REWRITE_TRANSFORMER = """
@@ skipping 24 matching lines @@
           "transformers": ["\$dart2js", "myapp/src/transformer"]
         }),
         d.dir("lib", [d.dir("src", [
           d.file("transformer.dart", JS_REWRITE_TRANSFORMER)
         ])]),
         d.dir("web", [d.file("main.dart", "void main() {}")])
       ]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
-      pubServe();
+      pubServe(shouldGetFirst: true);
       requestShouldSucceed("main.dart.out", isUnminifiedDart2JSOutput);
       endPubServe();
     });
   });
 }